first of all don't send your film to costco. they have been known to be bad news in the past.
second, do you really need to shoot 800 speed film? what kind of lighting conditions are you shooting in?
Also, I'm not a huge fan of 200 speed film. To me it is kind of a poor compromise between 100 and 400. I try to stick with 100, 400, 800, 1600 and i've gone above 1600 a few times when i wanted some serious grain to my shots.