"as for the noise someone mentioned as the reason to go PC instead, HUH? You must have had one with a bad fan installed... even my old G4 desktop is silent.
If a computer has a fan in it, it may be fairly quiet, but it is not silent. My last PC from http://www.endpcnoise.com/
was remarkably quiet, but it did have a fan on the CPU and one in the power supply, and I could hear them. The new PC is cooled entirely with heat pipes that are thermally bonded to the aluminum case. No fans, no noise.
I searched around, and I found online discussions where fan noise on the Mac Pro was specifically mentioned. Because the Mac has closed, proprietary architecture, I'm limited to whatever hardware Apple decides to make. Since they don't make what I want, I'm SOL unless I radically mod it. With a PC, I have far more hardware to choose from.