Well if we want to get technical about it:
1997 = Murray Pro Model / Fluid
1998-1999 = Murray Pro Model / Fluid, reshaped board same name.
2000-2001 = Belmont (referred to know as the Motive), questionably one of the best all-around wakeboard shapes of all time.
2002-2003 = Belmont, reshaped 6 fin design. I absolutely love this board, and wish they still made it.
2004 = Temet, directional shape w/ 0.8" P-wings.
2005 = Murray. Same directional shape as the Temet, w/ 1.1" fins.
I've rode 3 of the 5 Murray shapes for the past 5 years, and have always loved the way they ride. Although I have to admit when the Temet shape came out I was a little weary about the directional thing, so this year I decided to try the 3DS, and I can't wait to ride it.