It's been a long time since I looked at hot car sketches...I love Kimberly Wu's style, nice call on that.
The ones I really remember from when I was a student and a few years after looking at this stuff all the time:
Kyle Evans - It's hard to find a good size image and these don't really do his photoshop technique justice at this scale, maybe someone else can share a bigger image
Tommy Forsgren - always loved his stuff - loose /gestural / emotive
I might look through my hard drive to see what else I might not be remembering.