G'day mate, Welcome to the forums, I'm quite new here as well and have recently picked up a KDX of my own, a 1992 KDX250SR, I've done a somewhat detailed build report on it so if you're interested in checking it out, please do here:
http://www.kdxrider.net/forums/viewtopi ... 34&t=22945
I always enjoy reading build reports to get myself hyped :)
Can't go wrong with the old XR's mate, I actually came from one as well, I had a 1994 XR600R but recently sold it and bought a 2000 XR400R, I find the 400's way more capable in all terrains and overall a better bike.