OK, who are you and what did you do with Farnham??!?
Farnham could not have posted that. It's air-cooled.
Seriously though, my son went to an XR100 from a PW80, and it treated him well, then went to a TTR250 that was not unlike the XT series. The TTR was definitely an under-sung motorcycle, simple, air cooled, zero maintenance. He rode the wheels off it and became a rather good rider. It did nothing evil and everything he asked of it.
A similar bike was the CRF230 Honda I bought for my other son. Really, it was an XR200 with an ebutton, fancy graphics and plastic, and 30 more cc. Bombproof.