I have gone from a AG Duos with Audiopax 88s to a completely solid state system and couldn't be happier. I actually built the other system in another room and slowly began to relize that I liked the sound of the solid state gear better. The solid state system was Parsound JC-1s and Von Schweikert VR4Jrs. The thing that bothered me the most about the Duos was the bass was never right. I thought it sounded pretty good until I got the VS speakers sounding so good. Everytime I would listen to the Duos I would immediately be taken back by the how bad the bass was. I tweaked the Duos for three years and I put a lot of effort into it, so it was not a matter of them not being setup right. If you can believe it I find the Solid State rig to be more dynamic than the horns! The tonality is better, I give up a little in the way of 3D that you get from tubes. It's all a matter of taste. I never thought I would not be a tube guy, but this experiement with a nice solid state system has proved me wrong. I actually think they can both sound great and do.
I think it is very important the type of listening you do. Is it loud dynamic music played at fairly loud volume? If so I think the solid state rig will be prefered, but you say you love the intamacy of the low power tubes. I've never heard low power with dynamic music and not felt like there is immediately something missing. So if you listen to soft music with vocals and not to much happening in the way of dynamics you may be sorry that you don't have that tube magice that does those kinds of music so well.
I think it is very important the type of listening you do. Is it loud dynamic music played at fairly loud volume? If so I think the solid state rig will be prefered, but you say you love the intamacy of the low power tubes. I've never heard low power with dynamic music and not felt like there is immediately something missing. So if you listen to soft music with vocals and not to much happening in the way of dynamics you may be sorry that you don't have that tube magice that does those kinds of music so well.