Actually, I decided to start the discussion:
Frohwind, 1988-2007 - 320 ISR/ONA foals - competed successfully in FEI Dressage, Prelim Eventing, and Open and Modified Jumpers
Ideal, 1990-2007 - 319 - competition career?
Art Deco, 1992-2007 - 308 - “competed successfully in Grand Prix Dressage, Hunters, Eventing and Jumpers”
Riverman, 1997-2007 - 191 - competed to 2nd or 3rd Level dressage (?)
Deutschmeister, 1988-2007 - 182 - competition career?
Alla Czar, 1988-2007 - 179 - champion “A” circuit hunter, also competed in dressage through PSG
Fuerst Gotthard, 1987-2007 - 149 - won multiple Grand Prix jumping titles
Contucci, 1999-2007 - 139 - competed through 2nd (3rd?) Level dressage
Hall of Fame, 1993-2007 - 136 - competed through 2nd Level dressage, also an “A” circuit Green Conformation and First Year Working Hunter Champion
Cor Noir, 1994-2007 - 99
Mannhattan, 1995-2007 - 98
Rainbow, 1996-2007 - 93
Conquistador, 1990-2007 - 87
Cabaret, 1991-2007 - 85
Sempatico M, 2005-2007 - 85
Impresario, 1990-2007 - 84
Parabol, 1992-2006 - 81
Wradar, 1998-2007 - 79
Welstern, 1988-2007 - 78
Pointmaker, 1995-2007 - 75
Phantast, 1993-2007 - 70
Landkönig, 2002-2007 - 67
Roc USA, 2002-2007 - 64
Bordeaux, 1992-2005 - 58
Lehndorff, 1988-2007 - 52