Replying to Dirtbikes

Yo, I'm thinking of picking up a used dirtbike for entertaining me this summer.

Wondering if any of you have any experience with them and if I could get some info from you.

I'm 6'4", 195-200lbs. I'm looking for something semi cheap, but not a fixer-upper because I'm terrible with mechanics.  Wondering what size(cc), brand, etc. that would be best for a beginner like myself.

Pretty much for just riding trails and rallying around. Not going to race it or anything.

Anyway, hit me back if you have any info.