I currently have a 5.1 setup that I am extremely happy with, however I am gettin ghte itch to add to it. I was curious to see what people think of their 7.1 systems vs 5.1 systems. If I was to then make the jump any suggestings on which speakers to add. Should i just get two fxi6s or should I get two more towers as my surrounds and maybe move my fxi5s to surround back? Anyway any thoughts or suggestions?