I dislike the Marshall AVT for a few reasons. Basically, the 12AX7 preamp tube doesn't play a very big part in the preamp section. The distortion is very muddy and unfocused, it wouldn't cut through with anything. Plus, the cleans on the AVT is not good.
I think the Peavey Bandit is a good investment, however, I'd like to push the Tech21 Trademark10 to you. Its a small analog solid state amplifier. Extremely versatile, based on the Sansamp technology. the distortion is modelled after the Fender (Tweed), Marshall (Brit) and Mesa (?). I played my friend's TM10 and was immediately shocked at the amazing tones it oozes out! The cleans were crystal clear and had a shimmer to it, very defined tone. The distortion was not bad, even though i thought the Mesa modeller didn't sound too nice but for the price, its well worth it.