What dirt bike should I buy?

I am currently 18, 6'3 and 180 pounds. I own a Crf250r and the bike is a load of fun but I'm looking for some more power and taller bike and am not sure what to buy, I'm considering a KTM, Honda, or Yamaha 250 2-stroke. I do mostly single track woods, some desert riding, and a few hare scrambles. Any input on whether to get a 4-stroke, or any input at all is greatly appreciated, Thank you.