No idea if the CPU fan is silent or what, but I'd be certain if you're going to the effort for a be-quiet case.
Also I know it's expensive to go higher, but I think that video card is going to be a big bottleneck on most games that came out after it was released. But if that's not an issue, power to you.
I guess if your CPU will be bottlenecked by the GPU, it won't be getting hot enough for much fan noise anyway. However the GPU fans might be loud if they're working hard.