You really dont need to spend all the money on an 850w PSU, you would be better to save more money and buy a 700w or 650 w PSU. Both would still run your system perfectly fine.
Thanks man ill definitely look into a cheaper psu my inital budget was 900 but ive gone 150 dollars over that. A cheaper PSU would help the money issue.
Yeah its really not nessicary to have that PSU, even Nvidia say the GTX Titan can run on 600W minimum, and I know a friend who runs a GTX770 on 550W. So all you need is like a 650w or something, which would still give you room to upgrade your system in the future.