Don't you hate it when a dealer posts that the amp he sells "blows everything else away"? Well, I hope this won't come across like that. The truth is, midrange is what I prize most, so I've selected my line-up accordingly. But I'll also mention some excellent amps I don't sell. Note that I haven't heard everything out there, of course.
How about first we do some that I don't sell, in alphabetical order: Solid State - Boulder, Gamut, Pass Aleph series. Tube - vintage Audio Research, Caztech, Convergent Audio Technologies, McIntosh. Budget solid state - maybe Arcam. Budget (or almost budget) tube - Rogue.
And now a few I sell, again alphabetical. Solid state - Clayton Audio, Warner Imaging. Tubes - Atma-Sphere, Thor, Wolcott. Intermediate priced solid state - InnerSound. Budget solid state - JoLida. Budget tube - JoLida. If I may editorialize a bit, JoLida stuff really shines in the midrange, and has no damn business sounding as good as it does for the price it goes for.
Especially in the lower price ranges, I agree with smw30@yahoo.com's suggestion to go with tube gear. Some of the higher priced solid state gear can be very good, though. However, if your speakers can be driven by a good SET or OTL tube amp, you're in for a real midrange party.
This list is by no means complete, especially as far as decent gear I don't sell goes.
Best of luck to you!