Do you plan on using a subwoofer for your 2-channel setup? If so, I'd look closely at the offerings as far as receivers go. While some may have a subwoofer pre-out connector, it doesn't mean that it has a built-in crossover. Plus, some subs now are no longer offering crossovers and speaker level inputs on the amplifiers (e.g. SVS PB10).
I think there are some great offerings in home theater receivers that you could use for a 2-channel system. Sure, the other amps will just sit there idle. But, having a proper subwoofer output and a built-in crossover can be pretty important stuff. I see you had the Yamaha 2-channel receiver on your list. The RX-V659 is the home theater model that would give you everything the 2-channel receiver has and more. Plus, I'm sure the price is pretty competitive between the two.
I once had a Music Hall 2-channel integrated amp. It had a pre-out for the sub. However, since my SVS didn't have a built-in crossover, it was nearly impossible to use the sub since all of my bass was being directed to my monitor speakers - and, the subwoofer, too. It made for some real muddy sound.