Thanks for bringing this thread back!
I agree with many of the choices already listed, though, as a younger fan only know most of the older ones from on tape.
For some others to check out, try the melting beauty of Portland 9/17/82 and the scorcher from the end of the Brent era at Deer Creek 7/18/90.
That last one got me to drive to Deer Creek from NY the next summer, and was rewarded with two solid post-Brent shows, though the scene was a hassle when the cops searched my car. I think the best Dew I personally saw was 7/10/89 at Giants in the pouring rain with two Nevilles on stage.
Thanks to Jerry and the boys that there are so many!