Depends on what I am playing, but the vast majority of the time it is our shop managers Dumble, which the bastard (I say that with great affection) got for $700. The guy who used to own that amp (who is an excellent guitar player, who is very concerned with sound) has recently been trying to get us to try the Carvin Legacy amp, which is the Steve Vai signature model. Mostly, I think he just hates that he lost the Dumble for $700, when it is worth at least $10,000 right now.
If I am just looking for distortion, with my guitars, I have not tried anything which is better than the Mesa Engineering Triple Rectifiers.
Strictly for clean sounds, I just tried my newest guitar (the Red one which gave me my Bad Day, which I posted of a while back) through an old (1964, I believe) Vox AC-30, and it was by far the best clean sound I have heard in quite a while.
But for versatility with great sounds, give me the Dumble.
Light
"Cowards can never be moral."
M.K. Gandhi