If there is one thing I've learned, it's that ARs are picky about ammo. Good AR ammo is also not cheap. Running the cheap steel-cased ammunition in ARs will usually destroy extractors. I would suggest against anyone buying an AR that minds paying almost 50% more per round minimum for acceptable AR rounds over AK rounds.WASR-10s run about $450ish and are a good basic AK-47 type rifle.
Or how about an AR-15 for $570?