Which Sling?

[Trihonda]

At work, I've used a single point bungee thing I can't stand (with a mash hook). My new BCM Reccee MCMR 11.5 has a number of QD options.

1 What do people find are the best slings for AR pistols?
2 Best slings for the money?
3 Where do you buy? LGS? Amazon?

I used to dabble in paracord, and toyed with the idea of making my own, but without experience on best lengths and fitment, I think I'll buy my first go around.

Thanks.