G'day mate look on eBay ..
$2500 will get you a cheap quad but more than likely it will be old or it may have something wrong with it with heaps of Kms on it and problems to fix.
I seen a Yamaha 660 4x4 2003 model all tweaked up with 720 hour on it selling for $4500
Your best off spending a bit more and getting a something a bit newer .
Look at getting a full independent system with power steering.
Goodluck