A mac book pro is 800$ of hardware for 1600$ its not a worth it. The only reason to use mac is if your building your own machine and installing there operating system on a self built system. Buying macontosh products is always a waste of money.
There's other reasons to buy a Mac than that, but yeah they are huge wastes of money. I paid a fraction of what my brother's girlfriend paid for her Macbook for my Lenovo Y500 and it does everything I need it to.
But a Mac Pro is $5,000 for an LGA 1366 configuration with a 5 year old GPU, not a good value if you ask me.
OP - you don't really need to upgrade from LGA 1156, you won't notice much benefit there. Buy a new GPU and you're set.