I would look at used as well.
I found a awesome Audio Refinement (YBA) Multi-3 on canuck audio mart for a great price. It's an fantastic piece of equipment and I'm using it in the exact same fashion you're thinking of (powering the front stage and letting my AVR (also the VSX-32) to amp the surrounds).
So I would obviously add the Audio Refinement Multi-3 to your search. As well, ATI makes a few of their products in three-channel versions. I think there's an 1800 series (AT1803) and a 2000 series version as well (AT2003).
I found a awesome Audio Refinement (YBA) Multi-3 on canuck audio mart for a great price. It's an fantastic piece of equipment and I'm using it in the exact same fashion you're thinking of (powering the front stage and letting my AVR (also the VSX-32) to amp the surrounds).
So I would obviously add the Audio Refinement Multi-3 to your search. As well, ATI makes a few of their products in three-channel versions. I think there's an 1800 series (AT1803) and a 2000 series version as well (AT2003).