Small bottom to mid level home theatre


Hi,
I would like to set up a "cheaper" home theatre system in a small room that we have. The room measures 8'x8'.
I managed to land myself a gently used Samsung 46" 8000 series for $500.
I plan on running 5.1 using in wall and ceiling for all speakers.
The blu-ray is an Oppo 93 (recently purchased).
I am considering either an Onkyo TX-509 receiver (soon to be released for $400) or a Marantz NR1602. The Onkyo specs looks good and it is only 13" deep (my cabinets will accommodate up to 14.5".
For in wall speakers i am at a loss. I have a bit of an issue with placement. The wall that the speakers and tv will be mounted on are about 20 degrees off parallel from the viewing position. I understand that speaker craft manufacture in-wall speakers..
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... that can be aimed. Are there any recommendations at what i should be looking at.
I will also need to place the center channel behind the tv (which will be on a pivot out wall mount to correct for the 20 degree wall offest); is there away that this can work. Can i eliminate the center channel all together?
Is there an in-wall sub you can recommend?

Thanks