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I do P90X now, I used to just run and weightlifting. Also you may get sick of 250 quickly or you may love it for a life time, it's really a personally preference.

I had a CRF230r and I got on my dads 2006 450 and that was actually pretty frightening considering I was also only 15 and I only weigh 145 pounds, and am 5'11" but I got a 2004 CRF250x now and I love it, I wish it was faster and had more power but since you are bigger then I...