Really, choose whatever you feel is good for you and price range is right.
I'm using a 750GB Western Digital Scorpio Blue 2.5", 3 Platter. It's actually faster then the 640GB Scorpio Blue I used. I really believe that Scorpio blue was defective because it was getting 15MB/s read and write as its top speed... when this 750GB gets 85MB/s write, 80MB/s read as its top speed, similar to a 7200RPM drive.
I also have a Momentus 7200.4 (500GB 7200RPM) drive with me. It's louder then the Scorpio blue but that's because its a 7200RPM vs the 5200RPM (yes, I did write that correctly, the 750GB uses 5200RPM).
Do note, depending on what MacBook Pro you have, you can most likely only use up to a 9.5mm drive, 640GB max size, 500GB 7200RPM max speed.