I don't Know anything about the Sony receiver but the Pioneer or Denon receiver should work just fine.
Since you are getting such a big TV and it seems that you are going to be using the system mainly for movies, have you consider the RC 64 for the center channel? After all, that is where most of voices come from during movies, just a thought.
For the speakers position I agree with the previous post, but it is not a HT room just a LR room so do the best you can with what you have.
For the subs, Klipsch has some good ones such the Sub 12 in the Synergy serie or the RW 12 in the reference serie. The RT 12 seems to be a good one too but a little higher in Price. A lot of people have been very happy with SVS and HSU subs, check them out.
Traveling so much lately I don't have the time to enjoy them but there it is
Main system
RF 83 , RC 64 , RS 62 and 2 x RSW 15 subwoofers
Epson Home pro 1080P projector
Harman Kardon 645
Kenwood KM Z 1 THX AMPS
Harmony 880
X10 Lighting system
Sony DVD/SACD player
PS 3
Monster power protection
Second System
RF 7, RC 7, RS 52 and RSW 12
Yamaha
Hitachi 50 inch Plasma
Universal Mx 500 remote
Panamax PM 5400 EX
Toshiba HD DVD
Sony CD player CDP CE 275
Apple TV
Spare set
RF 3, RF 7 ( project), RC 7, RS 3 ( 1) for sale, RS 42
SW 15 for sale
Custom 2 headphones
I will only speak about speakers which I either own or heard; everything else would be a guess and pointless.
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