Not sure, I know you can put up to 640GB 5200RPM HD in a macbook. You should try TechRestore. They sell HD and I think they put them in for you too. You can also go to NewEgg and look at HD's there, I heard Western Digital HDs were good. They sell HD's for lower prices too.
You can consider either the Seagate Momentus XT Hybrid Drive, which should be faster than a regular HD for your most common tasks, or go with an 2.5" SSD for the best performance possible, but at a premium price and more limited space.
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Not sure, I know you can put up to 640GB 5200RPM HD in a macbook. You should try TechRestore. They sell HD and I think they put them in for you too. You can also go to NewEgg and look at HD's there, I heard Western Digital HDs were good. They sell HD's for lower prices too.
Actually the biggest you can do is a 750GB drive, and I think those are mostly 5400 RPM. If you don't need one that big, I would go 320GB or 500GB 7200 RPM