you know, you only really need the bad@ss nVidia graphics cards to play games. Feh...I bought an XBox for that.
Add another internal drive? Uh...yea you can do that on a Mac. I've done it. Need BlueRay, HD-DVD, or floppy? External USB.
btw, outside of some industrial machinery users, who the hell uses floppy drives anymore?
oh, uh...liquid cooling? Correct me if I'm wrong, but doesn't the MacPro come with that?
Mac users know nothing about computers? Feh. Let me tell you, I've done tech support for both platforms. Probably 90% of all people who use computers know less than nothing about them, whether Mac or PC.