I need help finding a good dirt bike that would fit me right?

[Sam H]

I'm 16 and I'm looking to buy my first dirt bike and I want it to be a really good bike. I'm looking for it to have a pretty good engine in it but it doesn't have to be something to fast just something fun to drive and I have a friend that works on engines so me and him were going to do different stuff to it like paint it and do different upgrades to the engine so i wanted a pretty good stock bike. I'm 6 foot 2 inches tall and i weigh 155 so I would need something full size. I was looking at the Yamaha and Honda lines and i couldn't really figure out how they worked and what are the different models so i was really wondering if anyone could help me to make since of all these different models and tell me which would be a good first dirt bike and as for price I have a job so i will have a good deal of money to spend on it so i dont think money would be a factor in picking out the dirt bike i need.