Hi, I run a small business off an Early 2008 MacPro (8 core). I mainly do PCB CAD work, and find that it would be useful to have a second monitor. I'm considering a Dell 24" or 27" model. I run a 4870 which has a DVI and a display port. I'm also considering another computer as a back up, as I had a video card failure in the MacPro that left me unable to work for a week until a new card arrived. My question is this: do I buy another old Mac Pro as a back up machine and get the extra monitor too or just buy a 21" or 27" new Imac and use it as the primary system with an extra monitor, leaving the 2008 MacPro as the reserve machine. The software I run is via parallels and will run on a low spec PC. But I do not want a windows machine. What do you think?