Ride it for awhile and see what YOU want/need. Recommendations of things that work well for ME, might just be a waste of money for YOU.
FWIW. I bought my Versys as a foul weather rider/commuter. My farkles include:
A taller Givi windshield because I ride in the rain.
Barkbusters, because I ride in the rain, I'm amazed how dry they keep my hands.
Oxford heated grips, because I ride in the cold.
Swingarm spools, so I can put the bike on a swingarm stand for maintenance.
Seahorse boxes, mounted on SWMoto racks, so I can carry stuff to and from work. I've also done weekly grocery shopping on the bike. A bungee net makes it possible to carry a large pack of T.P..
SWMoto engine cages, to protect the engine plus provide a place for some higway pegs and possibly down the line some auxilary lighting.
Rear and side reflective tape to increase visibility.
Motocentric tank bag, convenient for gloves and the like while getting on and off the bike a lot.
Corbin seat, bought used, more comfortable, plus it stops me from sliding forward as much as I used to.