I think any card designed for recording is going to sound better than the SB. There are plenty of choices out there, and a search in this forum should bring up lots of results. There are other factors involved in choosing, like how you work, what other gear you'll be using, how many inputs and outputs you'll need, and the list can go on.
If you're new to computer recording in general, I'd suggest you stick with the soundblaster for a bit to get your feet wet. That way, when you go to spend a few bucks on a better card you'll have a pretty good idea of what you want and need out of the more expensive card.