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You want to look for one that has a Serial ATA (SATA). The Seagate Momentus should work but be aware that it's a hit/miss if you get a noisy/vibrating drive. A few of us on the forums had and opted for the Western Digital 500GB Scorpio Blue HDD instead. It's cheaper and performs as good for a lower price tag.
 
This might help as well: Tom's Hardware reviews 7 500GB laptop hard drives.

It says that Seagate drive is the fastest currently available, but consumes more power as well, so you may need to decide between speed with that one or longer battery life with a 5400 RPM drive.
 
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