I am 14 years old, 5'10 and 170lbs. I have a yz85 but need a bigger bike next year. I will only get a yamaha and don't know what's best for me, a yz125, yz250 or yz250f. A yz125 I might outgrow, the yz250 fits and I can handle it but I mostly do trails, and the yz250f seems as though if something goes wrong it will cost way to much to fix it. As you can see I have found a flaw in every bike and I am really not sure which bike I should get. Please help me make this choice, thank you.