You might want to start reading the 'BentRiderOnline FORUM As they are all about Trikes and 'bents.

I bought a TerraTrike 'Rover' for $999.00 and I love my Trike~! It's a 'Tadpole' - 2 wheels in Front, one wheel in back, seat height is 18.5" which is easy on the knees, has a weight limit of 400lbs. Trikes can be ridden most anywhere, roads, MUPs, etc - while the Trike itself is wider, it's not any wider than your shoulders.

Trikes are *not* as fast as 2 wheeled 'bents, but trikes are so very comfortable (a riding lawn chair)...