I'd say forget all the latest hi-tech wizardry and go for good second-hand gear; you'll get much more for your money, and something about 5 years old should be as good as the latest kit (also no point paying for "extras" you're not going to be able to use in your set-up). But make sure you can try it out somewhere where you can turn the output up WAY beyond what you're going to use for your performances.

G.