I was reading through that really fast. I was expecting to see an HD in there. Why'd you choose an ASUS? They're more expensive than other brands that are more focused on GPUs (XFX and Sapphire).
What's your monitor's resolution? That's the most important criteria for deciding on a video card.
Without knowing the BUDGET, I can tell you that the 5750 is NOT a gaming GPU. You'll need at least a 5770 for any kind of decent resolution. Even then, the 5770 isn't really a gaming GPU, but it's the only good choice under $200. If you can afford more than that, the HD 5850 is the best GPU that's still reasonably priced at $310.
I would have to agree in this range an amd is probably your best choice. While an I5 would be nice that's another 40 bucks on top of the cpu which is going to be draining right out of the gpu budget. The only thing that might want to consider is possible an hd 4890 which is older tech so obviously direct x 10 but you'll get a sustainable boast in performance over the 5770