AK's are great if you are a prepper but since they arent very accurate and arent as modular the better and more useful platform is the AR. I would save the Saiga till Hillary is elected then the price will double. AR's dont matter any will work as long as you have a decent trigger. PSA does have good deals on uppers and lowers.
"No, I am not a good shot, but I shoot often." Teddy Roosevelt