M20J
I've got 200hrs in an M20J and I'd agree with most of the comments above. It has a lousy payload (ours has 805lbs useful), and our club won't allow the aircraft to operate off grass at all. It is bouncy on the ground because of the suspension (or lack of).
However, it is a fantastic machine to fly! I love the controls, and if you land it just as the stall warner comes on it will be perfect every time. Land it fast and you'll be p-p-p-porpoising down the runway before you know it! I know it, it's only when I stopped concentrating so hard on the landing that it clicked!