To answer the question on what raid choice is the better onboard raid to use.

Here is a HDTach from my quad 150GB raptors in raid 0 from the Marvell raid controller. stripe size 64k. All tests were run with the same hard drives in raid 0

Marvell quick



Marvell long Same drives raid 0



AW9D Max ICH7R long Same drives raid 0



EVGA 680i quick Same drive in raid 0