Do it. I think the Mac Pro is an incredible fast machine. I have the 2.66 MHz version with 4 GB Ram and am already totally happy. It is so far one of the fastest machines around.

The only tzhin gthat would make additional sense is to have more than one machine for rendering. Especially when you want to do animations. Then network rendering is a lot of help probably and something to think about. With Infinite (5 or 6 does not matter) you can have Winodws PCs as well in the network so not all machines need to be Macs.

And not to forget, most sense does an Intel Mac make when you run a UB version on it. Which means a Vue from generation 6.

One day your ship comes in - but you're at the airport.