Someone Somewhere said:
Sabertooth is overkill; get a Z77 Extreme4 or GA-Z77X-D3H. They perform almost the same and cost far less.
Second the 8GB + 3570K. Get CL9 RAM though; make sure it's 1.5V.
A graphics card is the most important part of a gaming pc. Get the best you can (but ignore GTX680; it's overpriced and gets outperformed by a 7970GHz).
+1 ram and cpu and as for gpu depends on the game but yeah max your budget on gpu