Some hints
1. SSD Mounting. The SATA type SSD units are so small you normally need a small stamped metal adapter plate to fasten one into a standard 3½" HDD slot. MANY of these actually come designed to fit TWO such SATA SSD units into ONE adapter / slot in a stack, so that saves you space.
2. Most mobos have quite good audio systems built in (usually by Realtek) capable of flexible outputs to up to 5.1 Surround Sound (sometimes 7.1) plus 2-channel stereo earphones plus mic input. True audiophiles sometimes want better audio quality and opt for third-party added sound cards, but many ears cannot tell the difference. SOME need more flexibility and control of inputs for complex multiple sources and mixing, and may need a sound card or some external mixer for that. But for everyday listening and simple recording, a mobo-based system does the job well. See also Item 10 below.
3. All mobos have a system that can put out small audio beep codes to indicate problems at boot-up or to confirm a clean no-problem boot. The "beep codes" are not universally standardized, but you can dig up info on them for your particular mobo. At one time all mobos had a tiny "speaker" so you could hear these, but most now do not, so you cannot hear them. However, the Front Panel header on the mobo (often front bottom corner) has four pins marked SPKR, and there you can plug in a tiny cheap "beeper" accessory you can buy so you can hear these beep codes IF you want them. This "speaker" can NOT put out any normal audio from anywhere; further, those beep codes are NOT available to hear from any normal audio output device. In addition now, many mobos have one or more LED lamps to show diagnostic codes, and usually their info coding is shown in the mobo manual.
4. Re SATA HDD's check the costs. Often a single larger unit is cheaper per GB than a pair of smaller.
5. You made no notes about provision for data backups.
6. A good WiFi and Bluetooth system may be built into your mobo. Likewise a wired network port.
7. USB ports can get confusing because the names have changed. Start with simple older USB2. Most mobos have a least one (often 2) headers on the mobo, but VERY often there are NO sockets for these exposed on the mobo's rear connection panel. So then IF you want to use them for older slow devices like keyboards, mice, and old peripherals (thus saving USB3.2 sockets for newer fast devices) you need to create external sockets. This is easy. You can buy small items like this
https://www.amazon.com/StarTech-com-Port-Female-Plate-Adapter/dp/B00015Y0FK/ref=sr_1_5?crid=30ZQ9NMTI5BKM&dib=eyJ2IjoiMSJ9.8LYrW5_Yl4wixw_w8P_KIqIc5j1YpdwWIA7_C6czymcOFwpuMygK90522TnM-KT4gjl_4T_zV6sRZT8IIBh3CsFvJti9tNmam_kuLmR9gs0ErASP4TkFGgqn3i5O7odUSNVqUw4kdHHIgRe4FBuowiwAOVPgqDttX9zyqptXO4AcMZcehQH5uywOSLByL4oN8CCSMvJmTIJbmlgBvYSKnQMgZbPZBV9y_ZMuPO4_zuk.5R1-uouQ7WJGjlE1yp6tvRHdgq6Egzs4GKgngDM1hGw&dib_tag=se&keywords=usb+2+plate&qid=1737133942&sprefix=usb+2+plate,aps,146&sr=8-5
That one deals with a mobo with TWO USB2 headers (there is a design for a single header) and mounts in an unused PCIe slot on the back of your computer. It makes the TWO ports of each single standard USB2 mobo header available on the back of your system.
8. Newer USB now all are called USB 3.2 Gen
n where the
n specifies which speed version. Gen1 can move data at up to 5 Gb/s and uses either the USB 3.2 version of the old Type A sockets and connectors, or the newer Type C. Gen2 can move data up to 10 Gb/s and should really be used only with Type C connections, but can be used with Type A which may or may not achieve the full speed. Gen2x2 can reach 20 Gb/s and MUST be used with Type C. On a mobo the speeds are determined by which controller chip is used. Gen1 and Gen2 both use 19-in mobo headers of the same design, and each contains TWO actual ports. Many mobos place sockets for either or both port types on their rear panels in addition to mobo headers. Although technically they should use Type A for Gen1 and Type C for Gen2, very often some Gen2 ports are provided with Type A sockets just for convenience. (You can buy small adapters to convert such a Type A Gen2 socket to a Type C if you need that.) Cases with front panel USB 3.2 sockets of either Type and either Gen come with cables to plug into mobo 19-pin headers. For Gen2x2 the mobo header is a new Type E containing only one port. SOME cases come with front panel Type C sockets and an internal cable to plug into that Type E mobo header for such a port. Right now there are LOTS of USB 3.2 devices that use Gen1 fully, some that can use the speed of Gen2, and very few that really can use Gen2x2 speeds, but more of those will come. Consider your current and potential devices and uses for USB 3.2 ports as you choose a mobo and case. Note also that the USB systems all include backwards compatibility. That is, if you plug into any socket or port a device (or a limited-speed cable) that runs at a slower data rate, the port WILL work at that lower rate.
9. Note that the speed specs for USB 3.2 are the max data rates the communication subsystem can deliver. By design this is FASTER than the actual performance ability of the device so that the comm subsystem does not limit device performance. For example, no mechanical hard drive (with spinning disks) can deliver data over about 3 or 4 Gb/s. SOME SSD's can exceed that and get over 5 Gb/s (Gen1), but none yet can actually reach Gen2 max data rate of 10 Gb/s.
10. Any VIDEO card you install will also contain its own AUDIO output chip. This is because there is no standard way to send audio from a mobo or a sound card to a video card, and these days most VIDEO cars are sending their info out on HDMI cables to a monitor. So having an AUDIO chip on the video card means that cards CAN send stereo audio (but not surround sound) out on the HDMI cable to the monitor. Now, Windows can use only ONE Sound Output Device at at a time, no matter how many such devices may be in your system, and there's a simple Windows setting (in Sound Settings) you can change manually for WHICH device is to be used to send out audio. If you want sound to come from your monitor's stereo speakers you can tell it to use the audio ability of your video card. If you want to output from your mobo's audio system (Item 3 above) OR from an added sound card, you can choose either of those and ensure that you make the right connections from mobo or sound card sockets to your speakers. Anything more complex than stereo audio will require that since the system in a video card can do only 2-channel stereo. That also may impact use of headphones.
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