OK, after getting some feedback here and elsewhere, I've finally made the decision on what to get.
Budget: <$600
Overclocking: NO
Purpose: Oblivion, NFS:MW, BF2142, Video Playback, Surfing, some video conversion (DIVX->DVD). Will use for 3-5yrs.
Existing Gear: WD 7200RPM HD, Sony DVD-RW...