Hmmmm....I loved Cantillon Iris (the one time I was able to get it), I love 1809 Berliner Weisse. Seems people either love it or hate it, but I love Duchesse. I'd love to try some of RR or Jolly Pumpkin's sours, but as of yet I haven't been able to get my hands on any of them.
Cantillon Grand Cru or the Sour Brown that New Belgium brews. Can't remember the name. I'm actually going to a Sour Beer festival a week from today hosted by Upland out of Bloomington so I may update my list