After several years of playing in garages and basements, I've decided to join an actively gigging band to do some classic/modern rock stuff. Shows will range from small to medium and may include outdoor events. PA will be hit or miss it looks like. I've already puchased a Carvin B1500 which I tried and fell in love with immediately. Now I need to purchase some cabs. I'm looking to purchse 3-4 smaller cabs so I can taylor my set up for each gig (and also to save my back and fit in the back of my 4-door sedan). I'd like to buy used stuff if possible. Is this plan any good? What are some recommendations? Also can I mix different brands of cabs? Any help would certainly be appreciated!