Since you mentioneed shopping as a reason for the luggage, I'd recommend getting at least the hard and removable tail case (and, then if you can afford them, the hard s-bags, as well). Although, when loaded, the tail case will raise the center of gravity some, it is MUCH more convenient to load/unload. The tail case is top loaded (and waist-high), where hard s-bags are generally side-loaded and knee-high. If price is a problem, I'd get the hard tail case and soft s-bags to start.
Hard cases, IMO, are better because they generally hold more, are more weather-proof, protect the contents better, and provide better security. They should also last longer, allowing you to transfer them to your next bike by simply buying new mounting hardware.
Do, though, check the load capabilities of the bike and the weight of the bags and case yourself to ensure the bike can handle the load. Givi does also check this, though. For example, shortly after the original Hayabusa came out, Givi refused to sell (and recalled any already sold) their luggage for this bike because they learned that the seat sub-frame would not safely be able to hold the weight. So, if Givi will sell it, you are probably okay.
Good luck.