Well, after reading a lot of tests, browsing the web, looking at your replies etc, I think it looks like one of the following:
YZ125 05-07
YZ250 05-07
YZ250F 06-07
I still lean to the F cos I like the thought of that long linear power, but everything I read reckons the YZs have got great power for a 2-stroke. I noticed in one of the local sales websites a guy selling an 07 250T cos he was off OS, and he wanted $800. Either deal of the century or it really is HOT...
But... I think... I'll go for the YZ125, probably a good 06 or 07 if I can find one. I think the 250, while a good bike, may still be too explosive for me to really use fully. As I found with the CR500, too much power is not always a good thing. I want something light, chuckable, good steering, and which I can really wring the neck of and not feel intimidated.