Newbie seeking advice on front towers for dedicated home theater in 16' x 22' room. (Music listening will be done elsewhere.) Has anyone compared the above speakers?

Also, can anyone make sense out of surround sound technology for me? I've always been a "more is better" kind of guy, but is there anything to be gained from a 7.1 configuration compared to a 5.1 configuration for watching movies in a 16' x 22' room? And if I go with a 5.1 system, is it worth the extra money to get a 7.1 receiver in the event I decide to add a couple of speakers?

Thanks a lot--

theaterdoc