Lot's of good options out there and differing opinions.
Personally, my favorite mags are Circle 10. Top tier durability with the added benefit of being relatively low weight, but they are pricey. The Xtech Tactical magazines fit this criteria pretty good as well and are cheaper than the Circle 10s.
Steel milsurp mags are always a solid choice as well, very durable, but they do add some weight. Keep in mind, not all steel mags are created equal, there are commercial variants out there that are not built as well as the milsurp stuff.
If you want to load up on some cheaper mags for general range use then I would recommend taking a look at AC Unity. They are polymer with steel reinforced lugs front and back and can be had for very good prices.
Magpul isn't king of mags in the AK world like they are in the AR world. They aren't bad mags, but they are generally overpriced and/or not as robust compared to comparable offerings from other companies.