If you really don't need 100W (does anybody
really need 100W?, I bought a Marshall DSL 15C (they also have a head version) that has phenomenal classic rock tones. It nails AC/DC tone (say, Powerage or High Voltage type of tones) and also early Rush (Fly By Night sort of stuff). What I love about it is the classic Marshall tones, but it is also very versatile. Adjusting the guitar volume nails the transitions in distortion in "Down Payment Blues" for instance. Perfect match for the tone in "Little Lover" while also pulling off good matches for Social Distortion tunes...
Can you tell I like it?
For pure tone heaven, I agree with Todd: Bogner Shiva. But that's a whole other animal.