Front suspension, hard tail. But if you want more details post this in the mountain bike forum.

Also, I love www.speedgoat.com They have a huge selection and tons of MTB gear.

Clipless are probably the best single upgrade anyone can make for their bike. As others have mentioned, you will fall, but probably only at very very slow speeds and you won't get hurt. But if you MTB you are used to falling anyway. You feel connected to your bike, your pedal stroke is more efficient, and it forces you to get cycling shoes which are much more comfortable for cycling.