With the ssds I would say a few things. Keep in mind I actually use two intel x25s because they were the best drives for what we wanted at the time. Ocz originally had reliability issues due to poor controllers and intel came out with their own controller which was much better. Since then ocz (and most of the industry) use sand force controllers which are widely recognized as the best.

Intel's new 510 ssd does not use an intel controller any more. It has also been designed to excel in large sequential read performance rather than smaller random reads which is what we want. For a system drive you want one which performs well with random writes also (this is where the original ocz drives fell in a hole). The vertex 2 and 3 both perform at best in class level for random read and writes. If you are set on getting an intel drive (which I'm sure will not disappoint) then I would recommend looking at a 320 instead as it is designed around better random read/write performance which suits your use as a system drive slightly better.