i had a valve junior modded plus speaker change to weber, changed tubes AND bought a attenunator all for under $450 bucks. People who are interested in the valve junior and wants it modded should consider costs before buying from our local retail stores. Smtimes, it's really so much cheaper purchasing online or overseas.
As for the sound of the amp, you can heard the potential on it unmodded, with the mods, its a very very gd amp, seems to go better with single coils. Do not let the made in china tag out you off. Sold mine off though a while back - too many amps....