Hey Laurie,
Our good forum friend dllewel lives somewhere in Utah. I like Dave's
setup very much. He seems satisfied with his
Lexicon receiver, in case you were not confused enough.
Many people seem quite fond of the
Outlaw 1070 receiver.
I am not sure I'd let the HDMI switching drive my decision. Since you'll have everything in that lovely entertainment center, it really doesn't make a lot of difference how the wires get routed as long as the right switches get thrown when you press your remote button. I don't want to sound like a broken record, but a nice remote will really be a godsend, and, as already mentioned, some of the higher end receivers come with very capable remotes.
Is there a chance of mounting the speakers from the ceiling, or even very high on the walls and angled down? I'm sure the stands will be fine, but I like to get the speakers out of the way, because I'm almost as clumsy as the dog.
I don't think you need to understand
mosfet amps to solve your problem.
Thanks for your time and interest. Enjoy your journey!