I personly like the Atlas the tension for tilt and pan is adjustable, the legs can be set forward, back, down or 45 degrees forward. the feet can be swapped out with a simple detent. If you get a set of the leg extensions the height can be set at whatever you like by adding in a pice of rod. It does however need a picatinny type rail to mount.
http://www.accu-shot.com/atlas_bipod.html
