My personal ranking is something like as follows, but it depends a little on whenever the last pizza I had was, since some of these places that are farther down the list can be a bit inconsistent. Also, getting the pizza in person or eating it on the sidewalk right after you take it out (assuming you pick it up right when it's taken out of the oven of course) is always better, especially with the thin crust places, since when the pizza sits in a box for more than a couple of minutes it loses some of its texture.

Sally's

Modern

One Six Three

Ernie's

Pepe's

Zuppardi's

Da Legna

Zeneli

Next Door

BAR

There are lots of other good places (Roseland, Dayton Street were mentioned among others) but don't quite rise to the top tier list from what I can tell.

There's also a pizza truck that's good that people hire for parties and such, but I forget the name of it.