Right now I have a mid-2007 Macbook Pro that I originally bought for school. However I don't really use it as a laptop anymore, it just sits on my desk connected to my 24" monitor 90% of the time. So I've been thinking about putting it up on craigslist and getting a couple hundred dollars to put towards a Mac Pro. A few people have been telling me that a Mac Pro (low end Nehalem refurbished) would just be overkill and to jump on the iMac. I game a little so the idea of swapping out a graphics card in a year or 2 is a huge plus in favor of the Mac Pro but is that enough to justify the the difference between each?