In reply to:
Josh, both in theory and in practice, unless you have a very large listening room, the 5550 should have plenty of clean power for your M2s. Note that it has bass management at 90Hz which would work well with the M2s and VX-10. Also, as you've mentioned, you'll be able to add surround speakers later when the time comes.
JohnK hit the nail exactly on the head. And in addition, I'd say that in a larger room, he'd want bigger speakers (like say M60's or M80's as they have more drivers and a bigger cabinet to increase bass). I think for what you want, the best would be the M2i's with the Yamaha reciever and a sub that can be upgraded to surround sound later.
When you get this, try these 3 settings:
Main: Large | Bass: Both
Main: Small | Bass: Both
Main: Small | Bass: SWFR
I'd imagine that the middle one would be the best sounding or maybe the bottom one, as the bookshelves won't have to do much bass at all. But try all 3 settings.
