[Jetfanmack]

I would highly doubt he has anything huge. Maybe a pair and a straight draw. In any case, I would bet because there's way too many draws possible. The check-raise looks like he's trying to steal it from you on the flop. Personally, I would put him on something like 98, where he wouldn't mind seeing another card to see if he can hit his straight. That seems like too weird a play for him to be a bigtime player.