If I were you and i wanted a solo machine for gaming then what i would do is in this budget:
1) Loose i7 and replace with i5-3570k or i5-4670k , as for gaming The i7 will give you zero extra performance for games over the i5.(http://www.tomshardware.com/forum/334252-28-3570k-3770k-gaming).
2) Invest the saved $100 to GPU or motherboard .
As after overclocking (you will need more psu from your current selection)you would get very good performance on games and i5 can hold them very neatly and investing the rest in gpu would boost your gaming experience.