trident, all the Creative soundcards are good (equal in quality to most keyboards or sound modules) but do not equal the performance of the so called professional soundcards, e.g., Echo, Fronteir, Steinberg, Ego Systems, etc. I mean higher quality with respect to things like signal to noise, distortion, dynamic range and so on.

I would pick the Audigy card if you can given that you can load a wavetable greater than 32mb. The alternative would be to use SBLive and a softsynth like LiveSynth Pro to load your soundfont wavetables which are greater than 32mb in size.