A Givi box will not come with the necessary mounting plate, I'm afraid, unless it's one of a few monolock cases. It's a generic box, the mounting plate will either be a model specific one or a universal one. How much stuff are you wanting to lug around?
The Givi e528 mount will allow you to choose any Givi or Kappa Monokey top case. Givi and Kappa are virtually identical in most respects, from the same company but Kappa are less expensive.
There are much cheaper boxes out there, and some have drilled and bolted them directly to the bike.
