My dad is now ready to buy a bike. He hasn't ridden for a good 25 years. He does pereodically jump on my KX 125 and does fine. Basically he doesn't know what he wants. He has talked about everything from a CR250 to a CRF150. Any tips? He is about 5'10" 190 lbs. He definitely knows how to ride so that should affect anything. He wants a bike that he can trail ride with but also take on the practice tracks with me. I was thinking a WR250, YZF250, CRF230, KDX220. please help!