You do realize that you can get good, accurate, brass cased American 7.62x39 ammo? And yeah, my AR in x39 is a lot more accurate than my SKS or AK, so I would expect a bolt gun to be even more accurate.Keep the SKS's
Shoot the snot out of em and enjoy them.
If you must have something different and want an AK maybe look around and find a MAK90.
7.62x39 and bulk cheap steel case ammo probably isnt going to impress or be a whole lot more accurate in a bolt action than an SKS or AK.