Here's the following I know of:
Eliminator (factory outlets) store in west Fort Worth
Mike Tomlinson is the man (familiar name isn't it!! I think he is related to)
Eagle Marine - Wellcraft (right next door to Eliminator)
International Boating Center - Baja and Wellcraft in Dallas
Loe's Highport - Fountain (about 100 miles north to Lake Texoma)
There are a couple newer ones in Lewisville (suburb of Dallas that have hi-po boats but can't think of the names. One of them is a Formula dealer. I think you will get some more responses about this and someone will throw out the name.
When it gets closer to your visit, I'll keep track of this thread and we could get a bunch together at Sneaky Pete's in Lewisville and go to the party area on the lake.