What is a good beginner bike for me?

I've been riding ATV's for many many years starting with a 50cc Suzuki, 90cc ArcticCat, and now a 300cc Honda Fourtrax 4x4. I have a lot of experience on the trails and I know how to ride a bike but not entirely comfortable. I'm a 15 year old male, 5'9 155lbs. I want a good 4 stroke and i'm going to be going on a lot of trails. I get bored fast so I want one that will be fun to ride. My dad always feels like he can fix everything and whenever he tries to order parts or fixes my rides they always break down into a bigger problem and end up paying a ton of money in the long run so I also need a strong and reliable dirt bike that barely will have issues. Any suggestions?

Added (1). Thanks for your answer, Samuel. I did a little research and i'm not too sure about which year I should get. I've heard the '07 was great to have with little problems, what should I look out for and the years to avoid?

Honda crf250x? They are a good trail/enduro bike they are honda so they are great quality and won't break down as much as a 250r or a two stroke. Also, look into the ktm, husaberg and husquvarna enduro bikes. Those 3 makes focus lots on enduro, but can be more pricey than a japanese bike.
Hope this helped.
Sam

Kawasaki coyote

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