A2's are perfectly serviceable and work remarkably well, especially considering the price.
However, of course, I have some non-standards. Actually, I have a ton of them as I've been doing some testing. As Technique mentioned, the Vortex is great. BE Meyers makes my favorite one but it doesn't work with my cans. The AAC Blackout is in the same category as those as well. The Vltor VC-1 is also a good one. But, I think your money is likely better spent on ammunition or magazines than a fancy flash hider.