I'm actually more of a NY style fan than Chicago style, so take this for what it's worth...
It's Maxwell Smart's favorite place, and he's the one that took me here. The pizza was really good and it weighed a ton (for some reason, I equate weight with goodness for Chicago pizza) I almost dropped the pizzas as I slid them off the counter they were so heavy.
Tony's Pizza of Placentia
www.tonyslittleitaly.com
Not too much seating in here, but if you happen to be in North OC, you cna give it a try.
(just over the hill on Imperial East of Placentia Blvd is my 2nd favorite NY Pizza place, Mammalucco's)