Depends on your preferred riding style. Personally, I like touring so a larger gas tank and bags are my preference although I love to see all of the mods and redesigns that both generations offer to us such as drag bikes, cafe racers, fat tire bikes and wild paint schemes to name a few. I don't know many other bikes that can offer so many alternatives, if any.
Givi A34 Universal Windscreen
Morley's, double bar matte black coated frame braces
Motogadget m-Blaze Pin LED Turn Signal (Front and back, small but bright as fuck)
Engine guard and Feet Rest
Go Cruise GC-A1BK GO CRUISE 2 Universal Throttle Control System (A must have for long rides)
Leather Key Coffin Pouch (Made by me)