Do you NEED a motherboard with tonnes of features? because you could save a bit of money by buying a mid range motherboard. I'd say get the 2nd build, as 99% of the time it's the GPU holding back the gaming performance. (the I5's extra power would be wasted, as the gaming performance would be held back by the 6850)
maybe look at getting a more mid range motherboard, and spending the extra money on a better CPU.