As you can infer from the first reply, using the word 'Monster' on this forum is a faux pas.
Can you share some more detail as to your thoughts? Do you have to have in-wall/in-ceiling? I think you will sacrifice some sound quality going that route, but if it's just background noise then that could be a good solution.
Denon makes some decent receivers, but you will probably get more responses in the Amps, Receivers and Processors
Lastly, use the cheapest in-wall rated wire (CL2 or CL3) you can find, gauge to suit. 14ga is more than enough for in-walls. 12ga for the sub(s). Try Monoprice.
You may also want to post progress in the General Home Theater / Media Rooms