Lighter and more handy that an AK-47? The Kalashnikov action is as reliable as it gets and available in several different variants now. You can lighten the battle configuration with a synthetic stock and there are even some sporters on the market if you want to get away from the "assault weapon" look. If all your looking for is a something for "insurance", the AK-47 can be had A LOT cheaper than any AR-15 platform. So much so that you'll be able to afford a case or two of military ball ammo to feed it with. It'll also chamber and fire EVERY TIME.
Not that I don't like AR's and the like, but for economy and reliability the AK is pretty hard to beat.