Tecamp Puma 900 - have kept this despite going to a combo for most eventualities. Powerful, flexible tone.
GR Bass AT800 Cube - the combo that I went to. Very lightweight and very clean sound so I can inflict my own damage on it.
Ashdown Superduperfly (Superfly 1000) - the power amp section could be better, you can get an HF whistle, plus the two 500W power amps can't be bridged. However, the graphic/parametric MIDI controlled preamp is brilliant.