"... whatever is cheap".
For fun shooting and plinking, that is fine, and I also endorse reloads, including my own. But when/if things get serious, that is not good thinking. I am sure many folks will cite chapter and verse to prove the opposite, but in general the higher the price the better the product. Sure the big factories can goof, but IMHO they are far less likely to produce junk than the guys who turn out those "plastic bag" reloads you see at the gun shows, or that small "factory" that uses range pickup brass, salvaged powder and badly stored primers.
When things get "interesting", you want the best and most reliable gun and ammo you can find. Cost is not a consideration unless you put a "not worth much" sign on your own life.
Jim