Help me pick my next (early) DeLillo novel

Just for fun!

I recently got gifted some book money (yay) and amongst many other books I want to get I decided I should also add to my DD collection and get one of his early (pre-The Names) novels. Anything aside from End Zone, which I've already read and enjoyed.

What should I pick next? I'll go with the first one to get three nominations!

Side note: I've read a couple of the later novels and all of the ones from The Names through Underworld.