If you have time beforehand, you can get a wide band eq for the mic and cut out the frequencies that are causing the feedback. You could also try adding one of those foam wind covers.
I got a Behringer Ultra voice xm8500 for $25 and I love it. The sound quality is great. It doesn't make you wonder "does my voice really sound like that?" but more like a louder version of your voice. I do notice some feedback in small rooms, but its not terrible. I usually just turn it down when I'm not using it. It's been knocked off tables onto concrete floors on several occasions and still looks and performs like new. If you look up the reviews some say they like it better than the Shures.
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