I currently own a Windows PC and a Macbook Pro. Don't have any problems with either and I'm not considering buying a Mac Pro (not this generation anyway). I stumbled on the Mac Pro's page on Apple's website and that is the best looking enclosure I have seen to date. It appears there's easy access to almost everything. I know Apple is pretty locked down as far as hardware goes and I wanted to ask if it was the same deal with the Mac Pro. For instance will I be able to swap out a PCIe based graphics card for a better one if I so please (drivers permitting of course)? Will I be able to swap out the motherboard if I get bored with it and want new things?