Best internal HDD for 12" PowerBook (to upgrade)

I'm still in the process of acquiring a "new" 12" PB, but I think that when it arrives I will want to upgrade the HDD as a little do-it-yourself project. What will be the best possible drive to put in? I want the largest and fastest possible when I upgrade, and I was told it has to be a 2.5" IDE drive. Ideally, I would like a 7,200 rpm drive, but I'm wondering if that won't matter beyond a 5,200 rpm drive because of other hardware bottlenecks like the slower G4 processor.

Any help would be incredible.

Here is one of my possible choices:

http://www.newegg.com/product/produ...ebooks+/+Laptops-_-Western+Digital-_-22136159

Thanks!