I assume you want a long gun of some sort?
For that price range you are going to be looking at the AK variants - You aren't going to be able to realistically touch an AR in that price range.
The AK's will give you the caliber you are looking for and there aren't too many other long guns that I can see fitting your list.
You could probably get a shotgun in that price range, good for home defense, ammo is decently priced, but you aren't going to get a semi auto of any decent make in that price range.
There are several AK guys on this site, and I am sure one of them can point you towards a decent manufacturer, this isn't really my area of expertise...