Mine’s final now:
From the official Huqvarna accessories catalogue: Akra silencer + bracket, headlight protection, roadlock
Other parts: Motogadget m.blaze pin turn signals, Highsider Montana 2 mirrors
Custom made by http://www.g-speedshop.com (if you have the chance go check them out, they are awsome!): vinyl camo wrap, license plate holder, pilion (metal), solo seat, tank rack (metal also), front fender, radiator protection.
The custom seat (with gel and +2cm) makes a real difference and riding a full day is now painless, the custom rear plate holder in replacement of the ugly and massive factory one allows for slider spools to be mounted, making the chain maintenance a no brainer. The mirrors look quite cool and are also much more practical than the stock ones.
This summer I might go for a side bag, again custom made by g-speedshop to have something matching the rest of the bike.