WTB: KX, CR, RM, YZ

[gixxer188]

I have some money burning a hole in my pocket and I'm looking for a MX bike in either a 125 or 250 flavors within the $700-$900 range. I've been looking for the past week or so and I've noticed a big discrepancy in year and prices. I've seen 1990's KX's for $700 and I've seen 2000+ KX's for $700+. I've also seen some 1980's for the same price. If given the choice obviously I would prefer a newer model year for the same price.  No junk please and nothing that "has a motor, but it's not currently running" type of stuff.  I'd like to be able to get on and ride without too much work to make it rideable first.