What, in your opinion, is the best Marshall amp. I know the classic JCM800 has always been the popular choice but vintage ones are hard to come by and according to friends of mine the others in the JCM series are not as good. What about the Valvestate series? I have to say that I have an AVT20 practice amp and it's one of the nicest small amps I've ever used and I am tempted to get the AVT150 half stack because I find it responsive and warm with great tone, even though it's only tube in the preamp. Would you go all tube? I'm in the market for a new amp and I've pretty much set my heart on a Marshall so I will go to Guitar Center and try a few out. I just wondered what the popular consensus was. I want something that has a really chunky, warm and heavy rhythm sound, and a biting lead sound with sustain.