It seems with that budget, you are blowing it out with those 3 components. You need to consider ALL of the components that make up your completed PC. If you have already done so, please list them. If not, PCPartPicker.com is a great tool for this....here would be an example of a completed computer based on your budget (considering it is the tower by itself, is designed for gaming, and you already have an OS):
http://pcpartpicker.com/p/2m6Iw
Something similar to this, but I just kind of slapped this together...needs some tweaking I am sure! I am a bit of a fanboy when it comes to Corsair's PSUs and I know it is overkill, but this would offer you some expand-ability in the future if you ever wanted to tack on an additional card for SLI...