Re: SSD and HDD question
The price / space constraints of SDD are the reason why. Your best bet is - OS on the SSD, place your games that are going to need the performance boost most (usually what you play the most, at least as far as large games go), and put the rest on a storage drive. You'll get lightning quick boots, and still great read/write performance for what you need it for the most. And you can always swap around which games you have on there and which ones you have elsewhere, should your priorities change.
AMD FX-8150
Gigabyte GA-970A-D3
16 GB G.SKILL Ripjaws Z DDR3-1600
EVGA GeFroce GTX 970
Corsair 800GS 800W Gaming Series P/S
OCZ Vertex 2 100GB SSD
Samsung 850 EVO 500GB SSD
WD Caviar Green 2TB HD