I have a 2008 Mac Pro which I am selling to a friend.
I bought the iMac because of the screen. I paid $2500+ for the Mac Pro, of which I use a quarter of the power.
Now I get an i7/1TB/4GB (Putting in 4 more of my own memory) for a bit less than I paid for the MP. I still won't use all the power and I get a FANTABULOUS screen.
Mine is used for gaming/personal and maybe some work email.