Having owned plenty of 58's, Sennheisers, Audixes, AKG's, AT's etc... I can confidently tell you that proper use and PA tuning is going to make much more of a difference than changing the mic. As far as Audixes being better at rejecting feedback, this is completely untrue. In fact, I can not even count the times that someone has brought their Audix out and spouted out the same information. After several minutes of trying to balance the feedback problem with the tonality of the mic, swapping for a 58 has almost always solved the issue. Lately I have been using a lot of the Sennheisers, but that has not been a magic bullet either. Just as often as the Sennheiser sounds a little better, a plain old sm58 does as well. Once you get into the condensors of any of the lines their is a much more distinct change in quality, which often results in more of a logistical problem, so in the end it is a real trade off. As far as my favorites go, the Beyer M88, the Heil, and the standard Beyer TGX line sounds really good, but not all that different from the common offerings of all of the other quality companies. My bet is that a little judicious EQ'ing or PA retuning is what really needs to be done here, and a little bit of mic technique.