For Skiers choice, it was the Launch in 1999. They of course call it the "first boat designed specifically for wakeboarding" but the Centurion Wave certainly predates it (even though it was a joke of a design).

Innovations and Awards
•1981- Introduction of the Supra Sport, the first Supra boat. Development of the adjustable wake plate. Introduction of a rear ski locker.
•1982- The new Supra Beast model is the first boat to have a big block engine. Supra Allegro was also introduced. First cuddy cabin inboard ski boat.
•1983- Introduction of the Supra Rider. First open bow inboard in the industry, features a playpen bow design.
•1984- Introduction of the Comp ts6m model. Development of the SupraTrac hull design. Supra boats feature Kevlar in hull design.
•1985- The Supra Comp awarded “Ski Boat of the Year” by Powerboat magazine. Introduction of the Supra Sunsport.
•1986- Comp ts6m pulls the World Cup.
•1987-1989 Supra boats tow the World Waterski Championships.
•1987-1988 Comp ts6m wins “Ski Boat of the Year.”
•1989- Moomba brand developed by Supra Sports, Inc.
•1989- Mariah is the first open bow model to win “Ski Boat of the Year.”
•1990- Sunsport wins “Ski Boat of the Year.”
•1992- Developed all-fiberglass construction in several models. Introduced a limited lifetime warranty on all models.
•1994- First year for fuel injected engines.
•1997- Introduction of the all new Moomba Outback
•1998- Introduction of the newly redesigned Supra Comp; introduction of the tower for wakeboarding
•1999- Introduction of the Supra “Launch,” the first boat designed specifically for wakeboarding. The first Supra featuring a V-drive, the Santera, is introduced.
•2000- Supra and Moomba are selected as Official Towboats of the America's Cup.
•2001- Introduction of five new models including the Supra Launch SSV and Supra Sunsport V, both featuring stadium seating. Introduction of double up seating.
•2002- Introduction of the walk-through transom in the Supra Santera. Supra and Moomba are selected as Official Towboats of the 2002 Gravity Games competition.
•2003- Supra and Moomba are selected as Offical Towboats of the 2003 Gravity Games competition. Skier’s Choice moves to new 142,000 square foot facility located in Maryville, Tennessee.
•2004- Supra continues its sponsorship of the Gravity Games competition held in Cleveland, Ohio, beginning September 15th.
•2007- Moomba and Indmar introduce the first catalyzed engine in the tournament boat segnment, the 5.7L 340HP MPI ETX-CAT. The first-of-its-kind marine engine that dramatically reduces harmful carbon emissions without sacrificing power.
•2007- Supra becomes the exclusive towboat of the WWA World Wakeboard Championship.
•2009- Supra and Moomba both achieve a record 4th straight NNMA CSI awawrd for outstanding customer service
•2009- Supra becomes the official towboat of BroStock