If you are going to use one a lot, I would recommend this one.
http://www.tooldiscounter.com/ItemDisplay.cfm?lookup=CHPCP717 I have had two of them for about 20 years. They are very controllable and I use them for up to 3/8" buck rivets and I have chisels for them also. When you use them, something is going to give. Mine have steel pistol grips which makes them a little heavier, but it also absorbs a lot of the shock.
