Any idea on cost turn key vs custom build
Do you mean purchasing pre-build vs building it yourself?
Pre-build will cost 1.5-2x as much for the same parts, plus Dell/HP/etc will pre-install a bunch of crap on your computer that will immediately bog it down. You get a warranty with turn-key, sure, but you'll probably be dealing with a call center if you use it...
If you take your time and carefully build your own, you're probably not going to have any problems, and this forum is fantastic at troubleshooting!
Its not like Im planning on gaming on a triple 4k monitor.
One can dream!!
One thing I know I would like is SSD harddrive. I love the way how fast that stuff boots up.
YAS.
It should be, I can max everything at 4k with SLI 980s, and scaling isn't exact.
Mathmatically speaking, 4k's pixel count is 8,294,400, where as 1440p's is less than half of that at 3,686,400. So, if two can handle 4k, one should be able to handle 1440p.
Mathematically, correct. Less than half the pixels, more than half the GPU output due to imperfect scaling.
However, I'll make a note that that particular monitor is a 21:9 aspect ratio 1440p monitor, not a 16:9 one, so it actually has 4,953,600 pixels. That's 60% of 4k, and a single 980 will spit out about 55-60% of the performance of 980 SLI (quickly looking at a few benchmarks), so it should be a good ballpark estimate to say that a single 980 would be able to max that monitor out if Dlaw can max 4k with 980 SLI.
Now parts!
Here is a list I put together real quick:
http://pcpartpicker.com/p/gBCzdC
It's missing:
A case (lots of choices, personal preference)
Case fans (I recommend Noctuas)
Optical drive (if you need one)
Peripherals (completely personal preference)
Notes:
You may want to wait for the 390x or 980ti around the corner as far as the graphics card goes.
You may want more or less SSD storage, and you may also want to add a hard drive also if you want a ton of inexpensive storage.
Hope this helps!!