Suunto Zoop. Even though by now, I moved on to own a Petrel, I would have bought it again. It was cheap, and there is no way to predict whether you will stick to the sport, no point getting anything fancy from day #1. Aside from a minor issue that turned out to be due to a bad battery, I have had 2 of these serving me and my wife well on over 100 dives. They seem rugged and popular, and easy to service. I once had a Zoop succesfully "serviced" on the spot by a shabby boat captain on Cozumel with the same knife he was using to cut his onions.