I've had all of the New Haven pies, 'olo is decently close and satisfying and I like Newton Sq Pizza though that's more greek-style. Greendale pizza makes a nice greasy pie. Volturno is high on my list as well but it's not everyone's cup of pizza. I like a lot of different styles of pizza, they all have their plusses and minuses. If all you like is New Haven style, you can always find a Frank Pepe's franchise in a few places in NE.

'Olo gets the pepperoni right. Cups that crisp up with oil in the center. Decently close thin crust too. Give it a try if you haven't.