Depends what kind of sling you're looking for. If you're into something tacticool, then check out the Specter sling:
YouTube - Specter 3-Point Tactical Sling
If you're into marksmanship, take a look at Turner Slings:
YouTube - Improving your shooting #7. Using a leather rifle sling.
I have both. I like the Turner sling more because I tend to like shooting my rifle at things far away (go figure) than up close targets.