dont see anything wrong with what your running.
Your current setup with the 570 will be more than capable of running the latest and upcoming games for quite some time.
Is your i5 stock or overclocked?...could get a decent aftermarket CPU cooler and overclock some for better performance.
For the GTX 570 do not go for the Stock Design Nvidia cooler.
Get something like the MSI Twin Frozr or the Direct CU II which will let the GPU stay cooler.
Even though the i5 750 is not capable of bottlenecking but if you find it slacking behind then you can always overclock.
But I think your should overclock since you already have an H50.