Need Sub and AVR advice for B&W CM1


I am planning to buy B&W CM1 bookshelf speakers for my fronts, B&W CMC center and B&W CWM 650 in-wall speakers for the rears as part of a 5.1 system.

Need advice on a good AVR and a good subwoofer to match with the system. I will be buying a new Panasonic 58" 1080P plasma. Video is as important as audio. The sub needs to be small--may only have 14"-15" of space, max. The room is about 11' by 18', but it is not completely enclosed. There is a 6' wide entranceway into the room in the back left corner.

Was thinking of new Denon 3808ci AVR or new Onkyo TX-SR875 AVR. Any thoughts?? Have no idea what i should do for a sub... If I choose to put the sub in the audio cabinet I am building, I may be able to buy a larger sub. Will the sub work just as well inside a cabinet, as opposed to being placed directly in a corner?
jacklenenberg
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Thanks Bob. I read somewhere that SVS and Hsu made better subs for the money than B&W, which is why I wasn't thinking B&W...
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Would I be better off with an Arcam or Rotel AVR than Denon or Onkyo? How much of a premium would I have to pay to step up to these brands? Is it worth it?