I am thinking of updating my 5.1 system to 7.1. Although, I wonder if the two extra speakers will really change the overall sound from DVDs. The surround speakers in a 5.1 system don't really get used much except for special effects. Adding two more speakers seems like a waste.
I would appreciate your feedback.
My system:

2-M60
VP150
2-QS8
EP500
Denon AVR4806

maphiker