In addition to the Echoes 10/22/14 theme, I second Pete’s suggestion of the jam chart. A few quick abbreviated notes from over my breakfast:

-It is hard to go wrong with literally any 95, 97, or 98 theme. All are worth spinning.

-In addition to what’s been mentioned, I’ll throw out the Went theme (8/16/97) in which the middle jam is where the band writes and/or experiments with the WTU? theme. Earlier in that week, 8/9/97 theme is also good (and stick around for that Ghost two songs later!). A bit more famous, 12/29/97 and Ventura 98 (7/20/98) are also pretty solid.

-My personal favorite Theme is 7/26/99, which has lots of extended feedback matched with classic summer ‘99 swirl. For that matter, all of that second set is worth your time to hear - easily my favorite set of Phish.