After markets give you more freedom due to the restriction on the stock tank range.

24L Acerbis 24L Acerbis 24L Acerbis Rear Seat Tank
Acerbis Fitting Kit Alloy Italian CRF Clarks 16.3L Clarks 16.3L

Monnier MXR650R Monnier MXR650R White Clear Monnier  
Large Clarke's tank, these are a favourite of ours, just under 18L of fuel, the finish, the fit and the quality is probably even better than an original Honda tank. Colours perfect too, we actually think they improve the looks of the bike. (Note standard graphics fit this tank)
IMS tank, this is over 19L lovely big Sahara tank, a bit of a must for Morocco or over land/touring.

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