Mac Pro?

I need some choosing which computer to buy...

I'm wondering if the mac pro is the computer that I need. I need a computer that will run a 3D visualization software under Windows.

I want to get a 3.2Ghz Mac Pro with 16GB of third-party memory, with a Quadro FX 5600 graphics card, using two 30" ACDs. The reason I want a Mac Pro is primarily because a want a Mac.

My question/worry is: Will the Windows software that I need to use run exactly as well or better under XP through Boot Camp on this Mac Pro as it would on a similarly spec'd PC?

It seems that some say XP only runs 32-bit under Boot Camp. Also, is this graphics card, processor, etc. fully supported in XP? And what about the hard drives?

If boot camp won't work, is there a better solution? Should I just buy a PC?

Thanks in advance, I just need some clarification before I make this big purchase.