I've ridden all bikes I'm trying to decide on. But I ride trails, some open fields. I'm 5'10 16yo and 140lbs. I'm looking to trade a 08 400ex I just got. I want a bike! I got an offer for a clean 06 yz125 and $150. Or a clean 03 rm250, the yz is mint. Should I get a 125 or a 250? I've had each but not for a long enough time to decide.. I'm gonna keep this bike till I don't want it anymore(obviously) but should I go 125 or 250?