Depends on what you want to spend, and what you size halls you want to cover. If you end up having a few "large" dj shows, you can allow for a PA rental house to provide you stacks and racks (Pa and amps). You might be able to find someone locally and get them to come out cheap ($100-$600) depending on the budget allowed.
There's a company in Texas (i believe they are based in Tx) thats making some mid-level cabinets that would be good for Dj stuff - soundbridge is the name.
http://www.soundbridge.comThe JBL srx series would be fine....
as far as amps, Crown, Qsc...cant go worng.
Used gear is fine if you know what you're buying....
I'm sitting at the house right now programing 24 I-tech amps...lol
http://www.crownaudio.com/itech for use with a JBL vertec rig
http://www.jblpro.com/vertec1/new_vertec/index.html and then having to write a program for JBL HLAs.
http://www.jblpro.com/pages/tour/HLA/hlamain.htmwould've much rather been playing VERSION 2.01!!! TY very much HTC! lol!