Fight back, every time with stuff like this. Stupid/drunk punters, who think musicians are there for them to abuse, are often shocked that a band member will leave the stage and pursue them half way across town......
1st reply says it all really. I use a QSC PLX2402 which is class H. Plenty of power, not too heavy. Just check that you pre-amp has enough output to drive your power amp, which my SRW Grand Prix does with no problem in this set up.
For a bit of old school optical compression, I can recommend the SGFX Imperial. Can be very fat and adds its own character, a lot like McCartneys sound on Taxman
I've got a couple of these, excellent value! Great fit for P and J bass:
http://www.flightcasewarehouse.co.uk/industry/product.asp?item=spider-universal-deluxe-bass-guitar-hard-case-7088-3980