There is no point to changing the drives. You wil not see any performance increases wiht SATA 2 vs SATA 1 drives anyway. Trust me....go with what you have. If you were upgrading to 10k rpm Raptors.......now they are worth the change. Otherwise, your doing just fine with what you have.
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.