Are you looking for new or used? If new, the new Beta XTrainers are supposed to be phenomenal entry bikes that have a really low seat height, and super friendly power curve (they are 300cc 2 strokes but are tuned to ride like 4 stroke, meant too be lugged down low with no hit up top). Beta is marketing them as entry level or non race bikes, and I met an experienced rider this weekend (who came from a faster 250xc) who absolutely loves how flickable it is, especially as he's a smaller guy.
I transitioned from a KLX last year to a 250xc this year, and you can do a few simple mods to mellow them out. I originally was looking for a 200 but they can be hard to come by at a good price.
I also rode a 250xcfw (4 stroke) this weekend, and it was a very friendly bike to ride as well, and didn't feel as heavy in the corners as I thought it would.
Lots of options, just stay away from the SX models or the big bore 4 strokes and you probably can't go wrong.