you can also fit a helmet in the right case, the one that is 44l.
But sure thing if you get the new 12GS than you should take the Zegas. If you get an old one than you can order the Holan kit for the 800GS so that you can use the 12GSA aluminium boxes on the 800GS - so no more problems with the old 1200GS and fitting the cases.
Keep the smile on your face!
F800GS - The ORANGE ones are faster!!