You may want to rethink your rig a bit.
Unless you are live streaming video games, there is no need for a big fat GPU in your system. Things like video editing, photoshop, etc. use the CPU, but generally ignore the GPU (except in certain specific cases), so you would not need a large GPU for that either. By all means, get something better than the onboard GPU... but a 780 is a bit overkill. Even if you are streaming game sessions, then you are likely only going to do it at 720-1080p resolution, so even a midrange card would suit your needs just fine in most games.
RAM is pretty much never a bottleneck on an Intel system. The gains in performance between DDR3 1333 and DDR3 2400 are relatively small. I would suggest getting something in the 1600-1866 range with as low of latency (CL timings) as possible. Somewhere around a CL of 9-10 should be just fine. Avoid ram with tall heat sinks... especially when using large air coolers. 8GB should be fine... but 16GB for HD video editing may be a worthy investment.
An i7 CPU is a good way to go for productivity work. Adobe software in particular is good about making use of those HT cores. As this is a production rig you should not OC your system, so a K-series CPU is not necessary. Also, if not overclocking, the CPU cooler is also not nessessary for cooling (though if silence is a priority then it is still a good call). I would still keep a higher end z87 based motherboard even if not overclocking simply for the sake of features and connectivity options. You could step down to an i5 processor and save $100, you would only be taking a 20-30% performance hit, but an i7 would be utilized for most of your workloads, so it is not a waste.
The single largest bottleneck in any system is your hard drive. This is especially true for video and photo work. 120GB is enough space for the OS, office, and an adobe suite... but not really large enough to use as rendering space or project files. I would highly suggest getting a much larger SSD in the 240-512GB range to give yourself some breathing room. Also, as this is a production rig, I would highly suggest sticking with a Samsung 840 PRO or EVO as they are extremely reliable, and can take a beating if using them for rendering. Kingston is not bad... Samsung is just better.
Your storage drive is also a bit on the anemic side. video projects can eat space like you wouldnt believe. Back when I was in school 10 years ago doing SD projects I found 1TB of space to be uncomfortably small, and HD content takes much more space. Unless you have a proper NAS (which you should have!) then I would highly suggest spending the $20 extra for a 2TB drive at least.
Speaking of backups, project storage, and NAS': Hard drives die. It is a simple fact of life. regardless of brand or age, it is something that will bite you at least once in life, and never at a convenient time. If you are doing any kind of productivity work then having a RAID either in your box, or externally on a server or NAS should be a #1 priority. You will have to make a best guess as to what size would be right for you, but you will want to have enough space to at least have an image of your system drive, and enough storage to house 3 years of finished projects. An internal RAID1 is nice because if a drive fails on you then you can simply replace the failed drive, and still have access to all of your documents even while the RAID is rebuilding. The other nice thing is that if your system dies on you, you can take either one of your drives, and use it as a normal single drive. This makes data recovery extremely easy. The down side to a RAID1 is that you are buying 2x the amount of drive space that you need for storage. Still, if you want something simple to manage with 2 drives then this is a great way to go.
If you find that you need more than 1 drive's worth of space (more than 3-4 TB), then start looking into a RAID5. RAID 5 is much more efficient with space as you only loose 1 drive's worth of space (ie 3x2TB drives is 4TB of space, 5x4TB drives would be 16TB of space). The down side is that if a drive fails, then it can take a long time to rebuild the RAID array, and you will not have access to your files until the RAID is done fixing itself. On a large RAID this process can take multiple days to complete. The other issue is that if your system dies then you will need to hook all of your drives up to a system with a compatible RAID controller to get your files back. Now that Intel has a decent onboard RAID controller that does not change much over time this is becoming less and less of an issue for desktops, but it can still be problematic if you have a system failure rather than a drive failure on a proprietary box like a pre-built NAS or file server that may go out of business before the box fails.
Still, if you intend to do real productivity work, it is worth the extra money. At the very least start out with 2x2TB drives in a simple RAID1 on your motherboard. But if you are a serious content producer then you will need a plan to expand your storage in the next few years, and it is far better to plan ahead on these things than to frantically start buying drives when you run out of space and end up with a sea of unorganized external HDDs and flash drives laying around.
Hope this points you in the right direction!
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