Another couple of AK options that you can feed the ammo you already have. Both the Romanian SAR3, and the Norinco NHM90 Underfolder shoot 5.56! These are a couple of rare beauties that are a good way to fill out, or get your collection started.
Romanian SAR3: $850
Norinco NHM90 Underfolder (Comes with 3 Mags) : SOLD