My wife's MB has something wrong with it. It periodically does the beachball of doom for no reason, and basically becomes unresponsive for lengthy periods. I suspect a memory issue, but don't really know how to debug that, and a faster machine would be nice anyway. The only minor issue is that I put a 500 GB drive in it because she takes LOTS of pictures. So, ideally, I'd like to move that drive to a new machine. So, what machine should I look at to replace the white plastic model, but still has an HD bay I can get at?