I have a 2006 Mac Pro with a Dell 20" monitor and the idea of upgrading first started off a few days ago. I love the new 27" monitors Apple do and I would be interested in getting a new Gfx card for the Mac Pro and buying a new display, however that would set me back over £1,100 so I started to look at the 27" iMac. I would get the bigger display built in and a better Gfx card (my Mac Pro has the X1900XT) and a faster processor, I would go for the i7. I could sell my Mac Pro for around £900-£1,100 looking at eBay so that would set the cost of the iMac at around £1000-£800, a bit less than a new Gfx card and monitor. Really I guess the question is how much of a performance difference is there between the iMac and Mac Pro with these configurations: iMac: 2.93GHz i7 4GB RAM 5750HD Mac Pro: Quad 2.66GHz Xeon 5GB RAM X1900XT I like the idea of a tower and its expandability but with a FW800 drive thrown into the back of the iMac that should be fast enough to access files, mainly my ever increasing Aperture library. In the future I could easily throw an SSD into either of the machines to speed the startup disk up, I know that is not so easy on the iMac but I am an electronics engineer so it doesn't phase me too much. Has anyone else made this transition?