Well...I already have a ruger mini-30 (7.62x39). I am getting a second primary weapon (one for me one for my wife) and want to use common ammo.
If you're series about this, go get yourself and your wife a couple of M1 carbines. The real ones, not the fakes. If you're not series, I don't have an answer for you.
Buy another Ruger.
Here is a Bushmaster chambered for 7.62*39. They call it an AK, but you'll know what it is when you see it.
http://www.bushmaster.com/shopping/weapons/bcwa2f14ak.asp
It's just odd for someone in the know to refer to a rifle as an AK-47. That is the term the media uses to demonize legal rifles. Basically anything with a banana magazine and wooden pistol grip is an AK to them