I was looking at Sanderson and Street & Performance and they both seem to be nice and come coated for just over $400. I started looking around some more and started finding others (Speedway Motors, JPL, etc.) for about half that coated. Is there that big of a difference where I will get what I pay for? I feel they will all flow well enough and am most worried about the coating and preventing rust. Would I be okay with one of these cheaper sets or should I go for Sanderson or S&P, etc?