Fortissimo III vs Audigy and vs Audigy 2

Which one will be the best ? i'm using fortissimo III now with my altec lensing speakers and sennheiser HD 500 headphone .....it works great with my speakers but when i use my sennheiser...i can hear that it's poor on playing classical music..even SB Live 5.1 still "alittle" better than it......
i care alot at the sound quality...so which one will hv the best sound quality ?
Thanx alot =D

Between the three you've mentioned, Audigy2 is the best but there are others as good or better (in terms of sound quality). M-Audio Revolution 7.1, Terratec Aureon 5.1 Sky or 7.1 Space and the new Audiotrak Prodigy 7.1 (NOT the Prodigy192) are notable examples. Game performance wouldn't be as good as Audigy2 though and the quality difference probably wouldn't be as much as when upgrading from a Fortissimo3 or Audigy (or any other non-24 bit card) to any of these.