Have a look at the really good threads that Gman has put together already Session 9, some good info there already
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also it will greatly depend on your budget, i am presuming that the list you have are parts you already have in your possession,
you don`t mention a MB there,but i would go for an atx MB as you will have more room to work with,also you will not need to have a MB with integrated video card as you will be using your own.
also what speed is your ram? this too will have an effect.
If you are going to use your new comp`for high end gaming,make sure you have adequate ventilation and fans,
as i said at the start,have a good rummage around Gmans articles, and if you still need any help/info gis a shout and i will try to help you mate.