You can't go wrong with Hitachi or Seagate in a Mac - they're the most common OE drives.
I'd say to steer clear of WD - I've seen too many of the 2.5" drives failing. The desktop drives are fine.
I put a Samsung 250GB in my old MacBook Pro and had firmware issues with it. The Samsung was on special offer - wish I'd known why at the time. Having tracked the problem down I ended up having to put it into a PC at work to flash the firmware when they fixed it.