hey guys, i am back into the dirt biking game after about a five year layoff. the purpose of the bike i get is going to be mainly for trails and flat pastures, etc. i am 5'10" 170 and am trying to figure out what bike to get, and whether or not to make it a 2 or 4 stroke. I have been looking at the CR125s, CR250s, CRF230s, and YZ250s to name a few? what do you all recommend? I need help pretty quick, please.