You'll need an AM3+ MOBO. The Bulldozer supports DDR3-1866 (PC3 14900), but no one has officially released 'Bulldozer' optimized RAM. The G.SKILL F3-14900CL9D-8GBXL or F3-14900CL9D-8GBSR will work, but they're not necessarily optimized.
IMO - Wait for the new kits and wait for tests/benchmarking -- otherwise you'll be getting 'guesses' mine included.
What you have should be fine; see below. Unfortunately, I am not good at low budget builds; my mind can grasp a $800 build but not much lower. Windows 7, OS, alone is $100 for 'free' you can use Linux and a good variant is Ubuntu - http://www.ubuntu.com/download/ubuntu/download