I am leaning toward buying two of these and putting them in RAID 0
WD Caviar Black 500GB 7200RPM 3.5IN WD5001AALS SATA 32MB (3year)
[WD5001AALS] Greenlyph - 1078 Queen Street, Halifax - (902) 422-2453
a bit more than the Seagates, but no shipping and greenlyph is just down the street from me.