I have a set of brand new Sims on Ebay for about $20 less then retail (go for $45 each or so, am selling for $75). i would go the Sim route personally, that way if they scan the OBD II it will still be "reading them". I don't know about NJ but if you delete codes in NY it will spit out a not ready on the inspection.
http://cgi.ebay.com/ebaymotors/ws/eB...MESE%3AIT&rd=1