Personally, I don't think matching the rears is so important. For that matter, you might want to skip rears for now. Once the wife gets used to what she sees/hears then you can add them. Plus, running wires to the rears can be a nightmare. The Gallos are nice but they are not a true dipole surround.
I'd opt for a Marantz over Yamaha. It will drive everything better. Yamahas don't like lower impedances and it is dead on above about the power outputs dropping. You have to remember that the peak ratings will get pushed if watching a movie even if your average listening is 1 watt.
You are totally correct about wanting seamless matching across your front three. This should include matching the heights as much as possible. Are you going to put the center on the TV stand or wall mount it?
Finally, the SVS is good. There's a ton of choices out there in subs. Buy on Audiogon and save.
I'd opt for a Marantz over Yamaha. It will drive everything better. Yamahas don't like lower impedances and it is dead on above about the power outputs dropping. You have to remember that the peak ratings will get pushed if watching a movie even if your average listening is 1 watt.
You are totally correct about wanting seamless matching across your front three. This should include matching the heights as much as possible. Are you going to put the center on the TV stand or wall mount it?
Finally, the SVS is good. There's a ton of choices out there in subs. Buy on Audiogon and save.