Scott: I have several 1TB HDDs that I can install. And I have 2 which have OS on them. So one would probably go with the used Gateway I would sell. The other is main HDD in this PC until I can get a SSD.
g-unit: thanks for the RAM tip, stuff I'm still learning...
*Question (might be dumb) about the 400R case, can those 3.5' bays be modified to fit the 2.5 SSD?
*Is the i5-4670k really better than the 3570k? I looked and it seemed like the improvements in the newer model were intangible, same base / turbo.
*I noticed the PSU you chose was less watts. Did I just over do it? whats the advantage? I was thinking extra umph, leaves the ability to SLI GPUs at some point.
When you port your hard drive over you have to do a full re installation of Windows or your PC will crash on boot every single time. And I definitely agree - do not buy anything used, especially the CPU.
To answer your questions:
1. Yes all Corsair cases can accommodate SSD installation without the use of extra brackets.
2. It's faster yes. The stock speed is about the same but the differences lie when you overclock, and the motherboards will support next year's models (Broadwell). Where Ivy Bridge will be discontinued.
3. Yeah for a single card 750W is not necessary, and the Corsair CX are not necessarily known for being top quality. The CX750 is made by Channel Well where the Seasonic unit is much better quality.