IMHO!
Starline is very good and reasonable. $49 per 500 rounds. Once fired I buy at the gun show, but, you have to careful, some cases look well used.
Here's a couple of sites to help you in your search.
https://secure.starlinebrass.com/
http://www.gunhoo.com/gunhoo/a.r.brass.htm
Enjoy!
[This message has been edited by rinoray (edited April 15, 2000).]