I have a 7.1 system with the rear surround speakers. I would highly suggest spending your money elsewhere for now. The difference these extra two speakers make is subtle at best in most of my listening. Use that money towards the sub(s) instead. With that big of a room you are going to need it. Some subs have their own remote for volume control, etc and about any good receiver should allow you to easily adjust the sub volume independently which may help with the WAF
Unless you're gutting the room for other reasons you might try using some strategically placed reflective/absorption panels in your room first. There is a science to this but pay particular attention to the corners. Someone suggested AVSForums and that's a great place to start but bring some ibuprofen along as it can get confusing fast. Here is some light reading which may help you along your journey.
http://www.avsforum.com/forum/138-avs-forum-podcasts/1494052-acoustics-101-anthony-grimani.html
https://jlaudio.zendesk.com/hc/en-us/articles/205061040-Adding-a-Home-Audio-Subwoofer
http://www.audioholics.com/subwoofer-setup/an-easy-solution-to-subwoofer-calibration
http://www.klipsch.com/blog/how-to-set-up-a-7-1-system/
Unless you're gutting the room for other reasons you might try using some strategically placed reflective/absorption panels in your room first. There is a science to this but pay particular attention to the corners. Someone suggested AVSForums and that's a great place to start but bring some ibuprofen along as it can get confusing fast. Here is some light reading which may help you along your journey.
http://www.avsforum.com/forum/138-avs-forum-podcasts/1494052-acoustics-101-anthony-grimani.html
https://jlaudio.zendesk.com/hc/en-us/articles/205061040-Adding-a-Home-Audio-Subwoofer
http://www.audioholics.com/subwoofer-setup/an-easy-solution-to-subwoofer-calibration
http://www.klipsch.com/blog/how-to-set-up-a-7-1-system/
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