Precisely, that's sort of what I do right now with Xeons. Typically, I use a very high-end computer around 8-12 thousand for my main design and development. Then, that one is augmented further with 3 other computers that are setup as my render "nodes" which are on a CAT 6e ethernet system. I also have two NAS boxes with around 14TB of storage.
These are the sort of systems I really need and can use with my software. While they not need to be that extreme, I can use every bit of power you can throw at me regardless. That is why I hope the Mac Pro gets at least some major updates. Otherwise, I will most likely just build another cube box myself like in the Maximum PC Dream Machine 2010 with these new Xeons along with 2 or 3 nVidia GTX 590 or better cards in SLI for their "CUDA" cores.
Apple use to be in the ultra high-end designer phase back in the day, but their Mac Pros are sadly lacking now for anything close to the sheer power needed for 3D and CAD high-end work. They also need a fully 64bit OS with no 32bit at all. I was hoping Lion would be that way, but looks like they still are going the boot to 64 route.