Only coming what I have owned or had a good go at...
Marshall JVM410H - Very versatile, MIDI, relatively cheap and replaceable on the road.
Fender Hot Rod Deluxe - Cheap, versatile, takes pedals really well, and the clean is superb.
Marshall Plexi (or good copy) - No description necessary
Bogner Alchemist - For the price it's really Something. Grab and go amp, w/ FX and versatility.
Brunetti 059 - A world of tones and flexibility. Great features and MIDI. Not cheap, but excellent quality.