Overall really good build for the money. My only concern with the LGA1156 CPU is the compatibility with the more "performance level" CPU in the future, the 6 cores i9 for example will only work on LGA1366 (I don't know the plan for any LGA1156 equivalent). If you don't mind much (nothing wrong with that BTW) then no problem, you will enjoy your build I have no doubts; if you would prefer to keep i9 as a possible upgrade in the future, I would do the following alterations:
AsRock X58 Extreme, Intel X58, LGA1366, SLI, CFX (+27)
The bulk of the price difference is actually the CPU which is a shame because it's not really better than the i5 750 by itself. If you could find some kind of deal to bring the 170$ gap down, it would probably be worth it more.