AKs make no sense to buy in the current year. Any gun in 5.45 is irrelevant. So it comes down to 762x39 vs 556. 556 is lighter, cheaper, shoots flatter, is available at more gun store, is used by more people. 556 is really the only cartridge I'd buy an AK in today. But you look at a decent 556 AK vs a midrange AR and its just like "why bother?". The AR will give you more performance at a lower price, with something that's easier to get accessories on and to work on.
So I'd have to be REALLY in love with the AK to want one in the first place, and even then I'd have to get one in 556 to make any sort of sense.