Well, last thursday my computer locked up again, and ended up toasting both a 74GB WD raptor and another 80 gig SATA drive.
I got sufficiently pissed off, swallowed my pride, and visited the Geek Squad over at Best Buy. Talked to the guy for about a minute until he realized what was going on, and (hopefully) fixed it. Seems like my mobo manual was too vauge in the BIOS setup instructions, and the IRQs supposedly caused something strange to go on with the onboard sound. We'll see if that worked, otherwise it's time for a new PSU.