Brake system upgrade

Everytime this topic comes up, people say "buy a GT brake system off eBay and throw them on". I won't be doing that. Anyone have an affordable upgrade option for this? My rotors are rusted from the previous owner. My motivation is cosmetic but it would be money well spent if it can improve safety at the same time. Thanks!!

Edit: most of the problem is not finding GT brakes on eBay as many make it seem very easy.