I think this is an awesome, if not semiexpensive idea.
Line 6 got together with Bogner to design and produce a fully tube driven Spider III amph. I bet it'll be good for a screamin' solo or two.
At Line 6 : http://www.line6.com/spidervalve/ind...ve+CenterFlash
The head at MF : http://www.musiciansfriend.com/produ...ead?sku=487071
Of course, a tube amph with modeling and savable presets is not new. Hughes and Kettner has the Switchblade, which I believe is a bit more expensive. http://www.hughes-and-kettner.com/pr...de=prod&id=109