We're in the "shwa" from time-to-time and I'd say if you're looking for a good, thin crust, you're pretty much out of luck. The best we've found in that category is Avanti but it's just ok in our books...often soft in the middle and the meat toppings just don't taste that great. I've heard Hot Rocks (in Whitby I think) has a good thin crust but, I recall looking at a menu and they had odd toppings.
For regular crust pizza, we stopped in for a couple of slices at a newer place (for the "shwa) yesterday as we were en route to Bowmanville. It was called "Regino's" near King & 2. The pizza was actually pretty good. Sauce had a nice tomato flavour and the crust was really good...especially since he just pulled it out of the pre-made cabinet. We'll stop in for a full pie next time we pass through and see how it goes.
FYI, some say Fabio's (not sure what their 'za shop is called) has good pizza but we didn't like it.
Good luck & let us know if you find a great one.