I just bought the smaller Coocase and mounting hardware from twisted throttle, if you are not set on the Honda version, take a look, it will save you some money and is a good system.
I think the Honda version may be larger (45L) but the V37 (37L) case is good size.
I bought the following:
GPT.01.615.100.B SW-MOTECH Alu-Rack Toprack (Honda NT700V Deauville), black $149.99 1 $149.99
TT.GPA.014.100 Coocase to SW-MOTECH Alu-Rack Adapter Plate $35.00 1 $35.00
CC.V28.LLW.148AM Coocase V28 Fusion topcase, Luxury edition Save $89 - matte black $110.00 1 $110.00
For another 45.00 you can have the larger one, I'll be ordering one myself later today, buying the small one was a mistake for me, but I still like having the small one for around town.
Here is a link to the larger one -
http://www.twistedthrottle.com/trade/productview/7043/284/
I am attaching pictures of mine so you can see a real world installation.
Hope this helps.