hey guys, im 145pounds, 5foot8inches tall and have been riding really old bikes since i was about 10, and im 16 now..i rode my bros gf's motobike the other day, its a chinese bike, but brand new, its a 250..i was just wondering what bike should i get? a cr250 or yz250? or should i get a 125? it will be going through mud in forestry a fair bit, maybe little jumps, and will need alot of power(my bro has a cr450r i need to keep up with)? so yeah help plz..