I am basically going to be using as an HTPC replacing my AppleTV. So streaming files to it from my Mac Pro. I just wanted to know if it's really worth going for the 2.66GHz. Is it overkill? The geekbench results show very similar results. I can't make up my mind. Will the real difference be the Nvidia 320, so the processor speed won't make a difference? Any advice or opinions would be greatly helpful. Thank you in advance.