The GSX-mk2 is the first amp that comes to mind, but it's $2800. It's very neutral, the sound has body, and it has a good soundstage. I'm searching for something with the same signature and close in quality for half the price. I have some hopes for the Schiit Ragnarok and the Oppo HA-1 (DAC included!) but who knows? The Master 9 and Soloist are on my list of candidates. I should get a chance to hear a WA22 at the DC meet--if it delivers the clean non-fuzzball sound promised--it might be a good choice. I listened to Gary's TBI Millenia and it's not my taste, but if you want a warm, thick solid-state sound, it's worth trying. Gary's Odyssey Cyclops is pretty good, but it's huge and will take out a power grid.
I think there are some decent low cost amps that sound good, but they all fail to deliver the big soundstage good equipment deserves.