GPS wired right into the bike (accessory plug forward of battery). Marsee tank bag with power direct to battery (fused).
I'm saving up now for the Aeroflow windshield and another seat, Day-Long or Corbin, not sure yet. Try it out, but you might find the stock seat too soft, leads to "hot spots" after an hour or so of riding.
DON'T get the Kissan Tailblazers, get P3 lights instead, they actually work.
Cee Bailey has some nice bag liners for the saddle bags and they're the cheapest I found.
The bike is good to go right off the showroom floor, you'll find you want to add farkles pretty quick. Lots of good info on here and tons of opinions to help you make your choice. Enjoy!