The stocks are complete kits I make myself, and everything is included that you need to install your rifle in one. Nothing else to buy, unless you want a hand guard and/or a fore grip. I make those too.
If you are asking about which stock I'd recommend, then I'd say, "Whichever one you like the most". A lot of people like the "Thompson" style. I personally like the AUG style best because it is so well balanced, and narrower around the muzzle back to the magazine area.
All of them make people take notice, especially when they realize there is an old "commie" milsurp rifle in there!