Problems with SATA?

Leave the sata on native, using raid will attempt to set up a raid configuration with your sata drives. That either sets one drive as a mirror of the first (backup) so if one drive fails, the other still has all the data and will continue to work. Another type of raid combines the two discs for a total of 640 GB. You don't need to do anything special just plug them into the two slots on your motherboard. As for the PSU, I would upgrade or remove one of the dvd burners (and perhaps one hard drive). I hate how the PSU has more connectors than it can handle, but oh well. Everything else in your configuration should work well. Great job on the specs. I have similar, just an Intel based mobo and processor and a single stick of 1 Gig ram. Anyway, hope this helped.