Nah, I wouldn't put the build quality of a PC and Mac Pro on the same level, granted the tech is slightly older, but it all works together nicely.

I have a SGI Octane2 because it's been 'designed'...it doesn't have one cable in it, not a single one! The drives are all in pull out drive bays, and the system module and gfx cards pull out in carrier slots...It's actually been designed, not cobbled together. I work on a Windows based Quad core Dell everyday at work and cannot say I enjoy it, I'd happily pay a premium to have a Mac system running OS X. But that's a different discussion to be had in a Mac vs PC thread...

-J