Mastrole does some showcase camps that are geared towards exposure. That's what I would go to, I've been told....from a coaching perspective, by a couple of HS QBs parents....he's not that great.... And they parents of D1 QBs.
Darin Slack has camps all over, I've heard were pretty good from a technique perspective. Also, I've been told that IMG Academy (Bradenton) has 7 on 7 and QB camps ran by Chris Weinke. Those are supposed to be great.