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What Motocross bike should i now get? - ktm pit bike

OK, here goes, I'm 13 and 5'2.
I began to Bike 200cc 4-stroke pit 5 months, then moved up to a KTM 85SX, 3 months ago, and last week I bought a CRF250R, but the thing is, if I Voyage, Voyage I drive, I am interested for real power, the CRF250R is nice and everything, and I stay with him for a few months, but after that, go when I?
I think you should get a 250 2 stroke or a 450F, but this one, and the brand I?
I do not want particully Kawasaki or Suzuki, but I'm also open to the proposal.
I can not imagine how people are trapped in Yahoo Answers, and how to talk to me about everything, and I know people try to tell me about it, but I do not know, I want to know which of these should be: 250 2 . or 450F, and what brand?
BTW: I am looking for a bicycle motocross, enduro or not a bicycle "fun".

Thank you, I am not worried for my safety, I just want to know which bike to get.;

:)