Re: PA Recommendations
+1 on Yamaha.
I've had some recent experience with a Behringer packaged system, and it hasn't held up well. Lots of busted pots, etc.
I've also been getting aquainted with my church's Carvin system. It's bigger (24-channel mixer) but the quality is borderline. To keep the feature vs. (cost + size) ratio up, they use really small knobs & pots. Hard to read, hard to operate. One fader got busted before I arrived.
As other have said, used is good for amps and speakers. Definitely try before you buy when it comes to mixers. On you budget, stay away from effects and fancy stuff. What you need is a solid mixer, amp, and speakers.