help please?

1) Your Physical Size - 5'6 120lbs
2) How Physical/Aggressive Are You? - like a 9/10
3) What Do You Plan To Ride- MX/SX Tracks,Woods,Fields Or Friends Or ? mostly just mx thats what ive always done
4) Do You Have Any Riding Experience? yes
5) Do you think you will race ? yes i know i will
6) Are you mechanically inclined and will you be doing your own bike
work? a little but my brother and dad are
7) Do YOU have a preferance to a brand/ motor choice (2 or 4 stroke)?
ktm
8) Do you have a dealer close by your home that you might use and what
brand(s) does he carry?
KTM Yamaha Honda and i belive a suzuki/kawisaki dealer about 30 mins away
9) How much ($) do you plan to spend on a bike? any where from 4000-6000
10) Do you live in California? Nope
11) Your age?15
12) Anything else that you think would help form an opinion
im soft of looking into getting a 4stroke but im not really sure if thats what i want or not cuz ive always had 2stroke. and hight of the bike dosent really matter in my case.

i should be getting a new bike in the next few weeks i just cant make up my mind so ANY help is very apresiated.
Thanks in advance :)

thanks i think im gonna look into the 250sxf. but anymore ideas would be great!

thanks for all the help guys. i decided to go with the 250sxf im gettin it within the next 2 weeks=]