>> personally, at the end of your sessions, your sounds will most likely run back into the system as audio files for mixing or just simply back in for CD audio. if that´s the case, consider midi as only 1/2 the process? make use of the editing multi-track suite to pump up the same sounds differently?
But I/O only has an Audigy as his own sound source. To get more bang for the bucks, a 2nd hand synth is a more worthwhile investment.