I bought my 2013 NC700X used with 5,000 miles on it. It came with center stand OEM side cases, light bar and the power outlet in the frunk and heated grips. The OEM power outlet has a 1 amp max so I would recommend going aftermarket. The first thing I added was a set of bark busters, I got the VPS set and think I would prefer the STORM now because of the additional wind coverage. The next thing I did was replace the outlet with a 5 amp aftermarket and added a dual USB outlet also. Not sure if the order of the rest but sense then I've done the cheap level your seat mod, added a LED bulb for the headlight and tail light, replaced the foot pegs after breaking the one on the right side (twice) a auto chain oiler put a sit-n-fly seat cover, fender extender and some cheap straight from Japan cross bar for the handle bars, adjustable clutch and brake levers (long) a set of gators for fork protection, I recently bought a rear rack from another on the forum and I'm currently installing a fuse block and auxiliary lights with on/off switch.
That's all I can think of. Everything else has been maintenance I'm currently at 58,000+
I mostly use my NC for commuting to work 3-5 days a week it's 120 mile round trip and I'm riding from Los Banos to Morgan Hill so I'm going over Pacheco pass. I also go for weekend trips with my wife 4 or 5 times a year and solo trips when I can