EDIT: Add about $40 if not buying from Microcentre to the above two builds
What is your current PSU?
You might want to consider an 7870XT over the 7950 as it performs very close for quite a bit cheaper
Getting z77 is better as it gets you pcie3.0, USB3 and overall newer
z77 can also OC to non-k CPU's using the turbo method (3470 to 4.0ghz and 3570 to 4.2ghz)
I would go with Intel Core i5 build. Nothing wrong with the AMD FX build but Intel one is better. Drop the mobo and grab a Z77 which is the current iteration for that chip and has better features. And you should be fine. Here: http://pcpartpicker.com/p/CZCY