I like Pizzeria da Vinci on the Shunpike (route 3) in Cromwell (several other locations also). Nice thin crust. I think it may be takeout only, though.
jerry's pizza in middletown is also excellent. get the white sicilian.. call ahead even if you plan to eat in- that pie has a 90 minute prep time but is worth the wait
Jerry's Pizza 885 Washington St Middletown, CT 06457 (860) 346-5335