I never thought I would actually see such a thread. Are you serious? Why would you spend that amount of money on a mac? Just get an iMac or macbook pro if you want a mac, the mac pro is completelt overpriced.
I mean, if you want a PC that is user friendly and easy to modify, go with the mac pro.
But with a custom built PC, you get better specs.
All comes down to personal preference.
Good luck though.