I don't get all this hype about the new Sata 6GB/s. ... The conversion from gigabit to megabytes is roughly 3 Gb/s = 375 MB/s.
So 6Gb/s = 700 MB/s......I know of none, non-raided Sata drive, that would come close to this figure
This was a snip i just pulled off a page on the net.......the shall we say standard Sata II platter drive, spinning at 7200 rpm will net you about 65 to 90 Mb/s depending on outer edge or inner edge.........from what I'm seeing ATM ... 6gb/s mechanical drives max out at about 150mb/s tops!.....so to get to the 700Mb/s saturation point......about 5 to 6 drives (raided).........SSD a little different but still short.
My thought for what I THINK you want is have a moderate sized SSD for your operating system and put all your programs on a cheaper, conventional HDD.....even with a quickish SSD you'll be pressed to saturate the SataII except in a burst....for real world, you wont notice the difference
Aussie Allan