The Thousand Crimes of Ming Tsu by Tom Lin is under 300 and a fantastic blend of Cormac McCarthy with the HBO show Carnivale. I can't recommend it enough.
There, There by Tommy Orange is sure to be a classic about life as Native Americans in Oakland in the 21st century., it was nominated for all the most prestigious awards.
Anything by Elmore Leonard is worth a read, a fantastic writer, fun novels, and usually under 300.
If you're looking for something experimental, Interior Chinatown by Charles Yu plays a lot with the 2nd person voice and was a hit for literary critics.