Surround Setup advice (Speaker + Receiver)

[alrha]

Hi everyone! this is my first post here (i've been looking around the past few weeks). I do not know much about audio and as such highly value the advice of those more experienced that I.

I purchased a PS3 recently and as a result came to the realization that the time has come to upgrade from my all-in-one sony system from 5 years ago to a good quality surround sound system. (in the meanwhile i have the ps3 going to the TV via HDMI and audio out of the TV via optical to my sony system). I would estimate my living room to be about 15'x20'.

At first i was planning on bose as that is generally what one thinks of as a high quality sound system (was deciding between the v30 or am16). after reading threads on this site, i came to the realization that there are better alternatives which i never heard of before.

i went into a BB magnolia theater so see what my options would be. Also considering that i am putting in a new system i might as well go with the 7.1 and be up to date with the latest trends.

The recommendation of the BB sales rep is to get in Definitive Technology 5x ProMonitor 1000 5 1/4" Bookshelf speakers, the ProCenter 1000 4 1/2" Center-Channel speaker, and the Super Cube III 7 1/2" 650W powered subwoofer. For the receiver he recommends the Denon 770W 7.1ch Receiver.

I want the have everything wall mounted (will let them do the installation and run the wires in my walls - requesting 12 gauge speaker wire.) They are sending a consultant over today to see the room and mention any special considerations.

Considering that my sectional couch is against the back wall, i would set two speakers on the side walls on either side of the couch, and another two speakers about a third of the way forward on the side walls with three of course on the front wall by the TV.

Sorry for the long post (especially for my first one) but i wanted to provide as much information as possible and hear your feedback and suggestions.

Thanks in advance!