If it's something you're gonna keep for awhile and then move on to something else, Wasr's the way. If it's something you plan on keeping, I would suggest buying a Yugo. They are the "tank" of the AK's. AND you can buy them relatively cheap as well. Not Wasr cheap, but still on the bottom end of the AK price range.
Whatever you do though, DO NOT BUY A CENTURY BUILT AK UNLESS YOU CAN SEE IT FIRST. I've sold well over 100 Century AK's, and only had one with an issue, but if you can't inspect it first, move on. Check several mags in it and make sure they lock up good and don't have excessive mag wobble, and check the front sites for cant.
I would suggest looking for a Yugo reweld milled ak. Looking at $600-$700 and it is bullet proof. I've got a milled Russian that is rewelded and it has almost 10,000 rounds through it. NEVER a hicup.