I'm lucky that Cascade is pretty local for me, they have amazing sours. You should be able to find a few Russian River choices, I've had 1, Supplication I think, it was very good. I'll pile on the Rodenbauch Grand Cru bandwagon, it is an excellent sour that you can find lots of places.
The Brett white IPA doesn't sound good, don't judge them based on that!
I like dark and high ABV sours barrel aged with complex flavors. I find that the sourness cuts through everything, ties it together and makes them wonderfully complex whereas a 12% ABV barrel aged on vanilla with blah blah stout not soured would tend to be cloyingly sweet and disjointed.
