Your suggested speaker location would work well. Also you can send them as much power under 150 watts as you want. Anything from 50watts up would sound good. A 4 channel amp would give you the ability to either run the components speakers and some rear speakers or to run the mids and highs off 2 channels and bridge the 2 other channels to run the woofers.
Infinity Kappa 60.5s Component Speakers
U.S. Acoutics 2080x for the comps (80x2 @ 4 ohms)
1 ed e12O.44 in a 2ft.^3 sealed box.
Soundstream RUB500-1 for the sub (400x1 @ 2 ohms)