Kendrick Lemar if you're into hip hop.
I've had both section 80 and m.A.A.d city in the car for about a month or so now, and enjoyed both albums. Would definitely recommend if you like Hip Hop.
Depends if you are after new stuff, or just stuff you've not heard before. Two Door Cinema club are worth ago, Bombay Bicycle Club again.
The Black Key's El Camino is good loud in the car as well!