If Im in Lincoln it's definitely Ramo's no question!!!
Here in Omaha... I've tried Copp's and Oskar's. Neither one are particularly great, but better than Val's.
I tried some random joint... I think it was like Sam something and it absolutely sucked. Cheese flavored cardboard and it was cold.
Edit: The last time I ordered pickup from DaVinci's the dough was completely raw and disgusting. That's beneath whatever place called "Sam" that I can recall. Id rather order Pizza Hut than DaVinci's or that w/e joint in N Omaha