If you've been waiting to get the best Mac money can buy, well, today's the day. Apple's new Mac Pro is on sale, and it starts at an eye-popping $5,999. That's a lot of cash for the average user, but maybe not so much if you make your living on how fast your computer is. The Mac Pro is highly customizable, though, and Apple is letting potential buyers upgrade it to a ludicrous level. What do I mean by "ludicrous," you may ask? Well, the top-of-the-line Mac Pro costs $52,599. That's not a typo.