I have the top of the Line AR, But the carbine I would trust my life with and the one that I will grab when TSHTF is my crappy cheap AK. I have been through several Tactical rifle classes with it and it has never failed me, wile the AR where having multitude of problems.
also they are cheaper to shoot 762x39 is down to $200.00 a case now. And since the OP already has an SKS (also a very reliable and outstanding rifle) It just makes that much more sense.
OK let the punches fly