I spent like two weeks doing research and comparing prices (I had 4 drives to replace) and I have to say the Western Digital Scorpio Blue seems like the all around best option.
Its a 5400rpm drive, but if you look at the Tom's Hardware charts it performs almost as well if not better than the 7200rpm drives out right now. In addition the general consensus seems to be that at least partly due to the fact that its 5400rpm it is MUCH more reliable than the other's especially when compared to the Momentus 7200.4. Its also fairly cheap, I think the lowest price right now is around $100 (though its $96 at Dell and there's constantly coupons on it there.) Newegg has also had a few deals that put it around $90 over the past week or two.
What I ended up doing for two of my computers where the extra 100GB wasn't that necessary (Including my MBP) was buying two Western Digital Elements 400GB external drives from staples at $58 after $25 off $75 ejunkies coupons. Those contain WD4000BEVT (Scorpio Blue) drives and you can swap them out of the enclosure pretty easily.
Edit: Ha, I didn't even notice your link was to the Scorpio Blue. So far its been great for me, and runs a lot cooler and quieter than the drives I replaced. $99 at Dell Home
http://accessories.us.dell.com/sna/...&cs=19&c=us&l=en&dgc=SS&cid=39715&lid=1003769 but I'd wait for one of the 15% accessory coupons that seem to pop up like once a week. Code for free 2 day shipping: ZBC8LPSBMMRB28