I'm not a fan of St. Louis style pizza. (Other than the crust, sauce, and cheese it's not bad...) I'm more of a purist, with a NY style approach. A deep dish/Chicago style can be good, too -- but not the main thing for which I am looking.
What I've found so far is:
1) Racanell's, which makes a NY style that in NY or Boston (I grew up in Boston) would be only average but here stands out. (The CWE original location has IBC root beer on tap!)
2) Napoli in St. Peter which makes a neapolitan style, although the oven should be hotter for a better crust
3) La Pizza, which uses whole milk mozzarella in addition to the part-skim, and also has a very hot oven.
4) Neighborhood Pizza Parlor makes a respectable but certainly not spectacular overall pizza.
5) Dewey's in Kirkwood
I've heard good things about Pizzarelli's on Manchester Ave. (Ballwin?) and Il Vicino (sp?) in Clayton. There many, many places i have not yet tried. Suggestions?