Well thanks to some of you for your thoughtful responses. If anyone cares, I have decided to go with the RF7s and RC7 in the front. I will use the RS7s for surround and center rear. I do understand that the best system would consist of all the same speakers, but I simply do not have the budget or room for 7 or even 5 RF7s. After auditioning a system with RS7s as surrounds, talking to someone at Klipsch about what he recommends, and taking into consideration the amount of room and money I have- I feel really good about 2 RF7s, 1 RC7 and 4 RS7s. Thanks again,
Darren