The Moto P518 is regarded by many as the best car charger on the market at the moment. It's a rapid charger with a 1amp capacity and works great on the Nexus (as well as about a billion other microUSB devices).
The best part is it sells for $3.89 on Amazon. (Make sure you buy it directly from Amazon and NOT a 3rd part vendor to assure authenticity). Which is not that much more expensive than those crappy $1 charges you find on ebay all day.
I've got 2 and they look nice, are built nice and work great. They definitely put my Verizon, AT&T and Sprint branded chargers to shame, which have a difficult time charging with the screen and GPS on. The only downside (if you can even call it a downside) is the blue light is a bit bright at night. Not like staring into the sun bright, but somewhat bright.