Question First Time Build; Help Needed

With the new Ryzens in 2 weeks, will be even faster for a few $ more
Better SSD - Better PSU - NOT including keybaord/mouse/monitor

PCPartPicker Part List

CPU: AMD - Ryzen 7 2700X 3.7 GHz 8-Core Processor ($438.00 @ Shopping Express)
Motherboard: Asus - Prime X470-Pro ATX AM4 Motherboard ($245.19 @ Newegg Australia)
Memory: Corsair - Vengeance LPX 32 GB (2 x 16 GB) DDR4-3200 Memory ($248.60 @ Newegg Australia)
Storage: Samsung - 970 Evo Plus 1 TB M.2-2280 Solid State Drive ($309.00 @ Umart)
Storage: Seagate - Barracuda 2 TB 3.5" 7200RPM Internal Hard Drive ($85.00 @ Austin Computers)
Video Card: Gigabyte - GeForce RTX 2080 8 GB GAMING OC Video Card ($1049.00 @ Shopping Express)
Case: Cooler Master - MasterBox MB530P ATX Mid Tower Case ($149.00 @ Austin Computers)
Power Supply: SeaSonic - FOCUS Plus Gold 750 W 80+ Gold Certified Fully Modular ATX Power Supply ($163.00 @ Skycomp Technology)
Total: $2686.79
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-06-21 22:58 AEST+1000
 
You could build as is.
Cooling is adequate.
You have a very nice cooling case and a 240 radiator is sufficient cooling.

I might have some suggestions:

1. 9900K is as good as it gets. But, for gaming, you might find that the 8 core 9700K will be just as good and that might enable you to budget more for a 2080ti. If budget is no issue, buy the 990K

2. You have a very nice case with plenty of airflow.
A noctua NH-D15s air cooler will do the job just as well.
It will be less expensive, easier to mount be quieter, more reliable and...
It will never leak.

3. for a top end build like this, make the ssd a m.2 960 EVO pcie device.
pcie gives you much faster sequential performance.

4. I think WD may be considered as more reliable than Seagate for a HDD.
Here is a nice article on the WD rainbow:
And, consider using a 16gb Optane device to act as a cache for your HDD
https://www.newegg.com/intel-optane-16gb/p/N82E16820167426

5. 650w is enough to run even a RTX2080ti.
I suggest a 750w Seasonic focus gold. It is tier 2 on this list:

As a first time builder, here is my process:
MY build process:

Before anything, while waiting for your parts to be delivered, download
and read, cover to cover your case and motherboard manual.
Buy a #2 magnetic tip philips screwdriver.
I find it handy to buy a power switch like this for testing.
https://www.ebay.com/p/4in1-PC-Powe...or-Computer/631889283?iid=142232821294&chn=ps

1. I assemble the critical parts outside of the case.
That lets me test them for functionality easily.
A wood table or cardboard is fine.
2. Plug in only the necessary parts at first. Ram, cpu, cooler, psu.
Do not force anything. Parts fit only one way.
Attach a monitor to the integrated motherboard adapter if you have one, otherwise to the graphics card.
  1. If your motherboard does not have a PWR button, momentarily touch the two pwr front panel pins with a flat blade screwdriver.
  2. Repeatedly hit F2 or DEL, and that should get you into the bios display.
  3. Boot from a cd or usb stick with memtest86 on it. memtest will exercise your ram and cpu functionality.
  4. Install windows.
  5. Install the motherboard cd drivers. Particularly the lan drivers so you can access the internet.
Do not select the easy install option, or you will get a bunch of utilities and trialware that you don't want. Drivers only.
  1. Connect to the internet and install an antivirus program. Microsoft security essentials is free, easy, and unobtrusive.
  2. Install your graphics card and driver if you tested with integrated graphics.
You will need to remove the graphics card later to install your motherboard in the case.
As a tip when screwing the motherboard into the posts, give the screw a small counterclockwise turn until you feel a click.
That lets you know that the screw will engage properly.
Make a note of how the graphics card latches into the pcie slot.
The mechanism will be hidden under the card and may be difficult to work if you have not previously checked how.
  1. Update windows to currency.
  2. Only now do I take apart what I need to and install it in the case.
  3. Now is the time to reinstall your graphics card.
 
Better board, card, ssd, psu, etc...

PCPartPicker Part List

Type|Item|Price
:----|:----|:----
CPU | Intel - Core i9-9900K 3.6 GHz 8-Core Processor | $775.00 @ Shopping Express
CPU Cooler | be quiet! - Dark Rock Pro 4 50.5 CFM CPU Cooler | $119.00 @ PCCaseGear
Motherboard | Asus - ROG STRIX Z390-E GAMING ATX LGA1151 Motherboard | $368.00 @ Shopping Express
Memory | Corsair - Vengeance LPX 32 GB (2 x 16 GB) DDR4-3200 Memory | $259.20 @ Amazon Australia
Storage | Crucial - P1 500 GB M.2-2280 Solid State Drive | $79.00 @ Shopping Express
Storage | Seagate - Barracuda 2 TB 3.5" 7200RPM Internal Hard Drive | $85.00 @ Austin Computers
Video Card | MSI - GeForce RTX 2080 Ti 11 GB VENTUS OC Video Card | $1599.00 @ Mwave Australia
Case | Cooler Master - MasterBox MB511 ATX Mid Tower Case | $92.10 @ Newegg Australia
Power Supply | Corsair - TXM Gold 750 W 80+ Gold Certified Semi-modular ATX Power Supply | $155.00 @ Shopping Express
Monitor | Acer - XB271HU bmiprz 27.0" 2560x1440 165 Hz Monitor | $799.00 @ Centre Com
Keyboard | SteelSeries - APEX Wired Gaming Keyboard | $79.37 @ Amazon Australia
Mouse | Logitech - G502 Proteus Spectrum Wired Optical Mouse | $89.00 @ Scorptec
| Prices include shipping, taxes, rebates, and discounts |
| Total | $4498.67
| Generated by PCPartPicker 2019-06-22 00:32 AEST+1000 |