Well you should probably take this thread to the system builder section. That is where people get help with building new computers.
At first glance I can tell you this...
A lot of your components look good, but if you want it to be a gaming pc, I would say ditch the i5-750, get an AMD Phenom II X4 955. With the money saved from the processor and cheaper motherboard, you should be able to afford a radeon hd 5850.
I would also go for the Samsung Spinpoint F3 1TB for the HDD. It's supposedly the best bang for your buck right now.
Now before people start calling me an ATI/AMD fanboy, just note that I make these suggestions after just buying parts for an i5-750/GTX470 build.
If you want as strong a gaming pc as possible, that is my advice.
Move your thread to the system builder section, and follow the guides in the stickies. There is a certain way to ask for help