Hi everyone, I'm looking at purchasing a new 20" iMac this Summer, but I'd like to be able to coax some extra speed out of it (part of it is a "just because" thing). Has anyone ever replaced their stock drive with one of the WD Raptors? I've got enough money left to easily afford the 74 GB model, if not the 150 GB model. This would replace the stock 250 GB drive, and I would use the stock drive as external storage. I typically don't do any pro applications with my current Mac (a QuickSilver G4), but I do like quick load and seek times ever since I started tweaking my G4 for more speed. Thoughts?