After all this don't let the shop pick one.:) Just because they are a 'shop' doesn't mean they are all knowing. I've always thought one step above stock was a good way to go...thats 5-8 degrees more duration. There looks to be some good recommendations in this old thread
318 cam shaft selection/upgrade for stock engine. I thought the Mopar Performance P4452757AE cam was in the 'one step up' ball park.