Don't forget about the regular Mac Pro - I recently purchased 3 of them for my design team thinking a desktop should be better than a laptop - 2 of them have had a failure, 1 requiring a replacement graphics card the other needed a system reinstall - both took a couple days to get sorted out. I doubt our next round of funding will go towards Mac products - we can buy a Dell just as powerful with same day business support for WAY less - but to tell the truth none of the Dell Precisions we have bought in the last 3 years have had any issues.