It is hard to find HQ soundbanks on soundcards. Several years ago I owned a Terratec EWS64XL (500$ card!) but the quality was very poor compared to today keyboards / arrangers.

I understand in the first place you are looking for a GM-soundmachine.... not a recording device ?

My neighbour just purchased a creative Audigy SB Live Platinum! card (150$) .... it does not impress me at all.