For what it is worth a raptor drive would probably be overkill and has one of the highest $:gb ratios. Especially if you are still on pata. If I were you I would go with this, it's $80 and 500gb, plenty of room and speed for now, and if you do a new system later, it will make a good back up drive.
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Gigabyte P35 DS3L, Intel E6550 @3.25ghz
4gb DDR2 1066, EVGA 8800GT 512mb,
Cool Master RC-690, WD Raptor 150gb, WD 500gb and 250gb AAKS
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