Once you get into the whole discussion of 'useful bike upgrades' you'll find that there are tons of websites with suggestions on what to modify and what not. But basically it comes down to how deep your pockets are - the sky is the limit! There are some companies (most of them are German - funny that) that specialise on motorbike equipment for adventure rides - such as Touratech, Wuedo and Wunderlich.

I ended up opting for a centre stand  (makes it so much easier changing a tyre), some decent crash bars (just in case), a good old New Zealand sheep skin (with 15,000km in front of me maybe a good idea, no?), and some larger foot pegs (to make it more comfortable when riding in a standing position on gravel and dirt tracks).