Pablo, I have an older version of the Mini-30 in 7.62 X 39 in Stainless Synthetic. The accuracy wasn't the greatest but it is fun to shoot, felt like a small Garand or something.
.223 is accurate, but if you want it's nemesis cartridge to wreak havoc in the sand pits on tin cans and burned out cars you can't beat the 7.62 in cost, plus you get to hear the "AK47" roar without looking like a Taliban because I believe you guys can get the 30 rnd mags for the Ruger Mini-30 again?
So, if you haven't tried the 7.62 x 39 yet you are in for a treat, your face may get sore from grinning, and it won't break the bank.
Sorry forgot to add that the Mini-30 accuracy issues have been resolved a few years back, they tore down the assembly line at the factory and the gun won't disappoint accuracy wise I hear, but you'd have to do a bit of research.