What size dirt-bike should I get?

I'm wanting a dual-sport but if I had to get anything it would be a dirt-bike. I'm 6'1-6'2 and 209-215lbs. i had a dirt-bike for about 10 years it was a Kawasaki 110. and i loved it had no problems and such so i don't really know which brands are good so yeah. But thanks for any answers i get. i would also like it to be a 4-stoke.