Welcome to the board, 2010-15-20 (man you got them scattered),
I don't know much about the Stix, although I have heard of them. IMHO, a showcase team is only as good as the people running the organization. By that, I mean they are experienced at taking their teams to the events that will get the kids the most/best exposure.
There are any of a number of very good organizations that do that. The Stix may be a good one, but if you truly want to look at a number of options and see which one fits your needs, you should look at several of these types of teams. I would list them here, but I might leave someone out and get assaulted by my good fellow posters, so if I do, please take pity on me (in no particular order):
Dallas Mustangs
Dallas Tigers
DBAT (Dallas Baseball Academy of Texas)
McKinney Marshals
McKinney Mavericks
Dallas Patriots
Dallas Panthers
Dallas Drillers/Fort Worth Drillers
Fort Worth Cats
Frozen Ropes
BLSA Chaps
Texas Blackhawks
Texas Dukes
Texas Champs
Centerfield Academy
Most have websites you can visit and contact them.
www.bbidallas.org also has teams looking for players. There are also very good individual teams that showcase as well.