I ask this question to a couple of the coaches that were at Stingrays. They pretty much told me the same thing that Wolfpack has in his reply. They also mentioned the Orland Park, Ill tournment and Sluggerfest.
They also mentioned that you should try to get to a showcase within the region of the main colleges that you are interested in to get maximum effect (if you are interested in southern schools, then the Music City tournament would be a no-brainer). The coaches that I talked to were very understanding of the money crunch with the increase of fuel and how it will effect which tournaments a team can afford to go to.