I'm not sure which nail gun to purchase. I'm partial to Milwaukee, but the ad for De Walt is funny...
New Nail Gun, made by De Walt.

It can drive a 16-D nail through a 2 X 4 at 200 yards. This makes construction a breeze, you can sit in your lawn chair and build a fence. Just get your wife to hold the fence boards in place while you sit back, relax with a cold drink and when she has the board in the right place, just fire away.
With the hundred round magazine, you can build the fence with a minimum of reloading.
After a day of fence building with the new DeWalt Rapid fire nail gun, the wife will not ask you build or fix anything else again.
http://gadgets.boingboing.net/2008/07/16/m16-nail-gun-knocks.html