Stewart Home bears some similarity to Chuck Palahniuk. He's quite a strange guy, a member of the Lettrists, a death-art/coprophilia cult which was spawned by the proto-punk French band The Situationists. A lot of his work dealing with the punk scene isn't very good, he's in it too deep, but I have read and will heartily recommend his books Cunt and Slow Death.
Luke Rhinehart (which is a pen name, but I can't remember whose) is another Palahniukesque author you might try. Read The Dice Man.
Tony Vigorito is somewhat like Vonnegut, I recommend his Just A Couple of Days.
Actually, I consider Ray Bradbury to share some of the style of Vonnegut, but you're probably familiar with him already.