For trail riding, any type of "pit" bike will be far too small for any sort of comfortable, let alone enjoyable, ride for a full sized person.
If your budget is dictating 1000, the model you want to get will depend on your characteristics.
How tall are you, and how much do you weigh?
Are you an aggressive person and will you learn quickly?
(As others have pointed out, fill out the form found under "Help Us Help You" in this forum section)
Another important question is "How much have you budgeted for gear?" Even trail riding, (even slow trail riding) is very hazardous. The minimum gear should include a quality full-face helmet, Chest protector, and sturdy over the ankle boots (motocross boots preferred!!! NOT doc martins lookalikes that barely cover your ankle with flimsy fake leather. NOT "hiking" or tennis shoes or flipflops either!!)