Reliablity then comfort then personalize with your Riding style.
I'd first deal with some of the know issues to keep you from walking home and taking all the fun of riding the big KTM.
Sidestand relocator first and foremost as engine cases are expensive.
Replace clutch slave with aftermarket such as Oberon. Can loose your clutch any time.
Heated grips. No need to explain this one.
Better seat. Ditto to above.
A set of Akras as a gift to yourself just so you can hear the best sounding bike out there every time you hit that starter button.
Fill your soul everyday