I would get the biggest one that’s available. If you are going on a short tour, just use the saddle bags and the tank bag only, longer tour take the three pieces of luggage.
I have the Nelson-Rigg tail tote, the thing is huge and not very expensive. I love it, has many compartments so little things don't get lost.
I got it from here: newenough.com MSRP: $79.95,
they sell it for $65
http://www.newenough.com/nelson_rigg...ystem_page.htm
