Make sure to research any additional cables you may buy...

With that said, definitely pick up a QC3 charger. Also, get a glass screen protector that covers all of the screen, not just 85% of it like the one I bought. I like my case (https://www.amazon.com/Spigen®-Hybrid-PREMIUM-Premium-Protective/dp/B01DAN1XPE/ref=sr_1_3?s=wireless&ie=UTF8&qid=1470964158&sr=1-3&keywords=htc+10+case). These headphones are also really good (https://www.amazon.com/Bose-SoundSport--ear-headphones-Charcoal/dp/B0117RFPCC/ref=sr_1_1?ie=UTF8&qid=1470964211&sr=8-1&keywords=bose+android+earbuds).