Go here:
http://www.storagereview.com check their *LeaderBoard* . They pick best 5400rpm, 7200rpm, etc. Very objective in depth articles on hard drives,cd-rom drives.
It appears the new 100GB WD 7200rpm drive is holding the top as far as things stood last time I looked.
IBM has had some problems as of late. I run Maxtor drives and they run well,sturdy and fast so far [1.5yrs],and the price is good for the plain *white box*-drive only-. Check out mwave.com,a very good and fair reseller in my opinion.