Re: Ok what do you think......
How about a pod or a v-amp-2 (or both) into a solid state power amp?
My guitar teacher from awhile back had a 15 watt no-name little tiny practice amp that we'd plug into. Teaching isn't about how the amp sounds, (something which is trivially easy to learn) it's about what notes to play in what context (not so easy to learn, and something I have yet to learn, as I suspect is true of most guitar players.) A great guitar player will sound great through a crappy amp, and a crappy guitar player will sound crappy through a great amp. For teaching, a decent amp is just not even a requirement, so far as I can tell. Practically any practice amp with a recognizable clean tone and a recognizable dirty tone seems like it ought to be sufficient.
That being said, the modelling amps that impressed me most lately were some VOX ones. Line6 sucks for metal IMHO (for other stuff might be ok, though my tastes are such I don't consider myself to be a good judge of other stuff. Also other (crazy ;-) people seem to like line6 for metal. I like the metal sounds in the Behringer v-amp 2, but not so much in the Behringer v-ampire amps, though I haven't played with 'em much.