GQBalla: A nice simple hard-tail.
Hydraulic disk brakes, front air-shock is nice (but not necessary, coil shock will do) with 100mm min travel, 2 or 3 chain rings up front, aluminum frame. You're looking somewhere in the $1,000 - 1,400 range to find something very well equipped. The market is extremely saturated at this price point.
Wheel size depends on your preference and may take some riding to figure it out. If you're going to be riding any twistier trails a 27.5 may be a good starting point as it 'combines the best of both worlds.' I prefer 29's, but they can be a bit stubborn on tight tracks.
examples include:
https://www.trekbikes.com/us/en_US/b.../2040600-2017/
https://www.giant-bicycles.com/en-ca.../29186/100802/
http://www.bikes.com/en/bikes/fusion-29/2017?tid=76
https://www.specialized.com/us/en/me...comp-29/115498
http://www.norco.com/bikes/mountain/...untry/storm-9/
http://www.konaworld.com/fire_mountain.cfm