Kind of depends on what you want the sling for.
Do you want a shooting aid as in a match type sling? Then look at turner's.
http://www.turnersling.com/
Do you want a tacticool sling? There are lots to choose from with different types of mounts, singe, dual or even three point and combinations of the three. Personally if you aren't military or police, I really don't think you want one. They look cool but can be complicated and really require that you train with them. They are called tactical slings for a reason.
If you think you need a tactical sling for home defense your wrong. By the time you sling up it will probably be too late and if you don't sling up you have this floppy thing catching on things and effecting your aim and if you get into a fight the bad guy has something to drag you around with or it's flopping around between you.
Want to try it? Get a tactial sling, sling up let go of the rifle and try hugging or dancing with your wife or girlfriend. Now imagine fighting with someone.
Do you want a carry sling for field use while hunting? Your looking for something for comfort with lots of adjustment to allow for differences in clothing. Get one that you can use as a shooting aid. Tacticool slings aren't necessarily a good choice for this type of work either.
And if you are just a range guy and aren't going to use it for any of the above reasons, save your money. I have a box of all of the above and never use any of them.
Did you notice I said I have a box full. Damn I look cool!
Just an old guys 2 cents