I'm a huge fan of Tillamook Ice Cream, which is made about an hour from here on the coast. There is no way I could pick a single favorite from all their flavors...
Sheister - I came across a seasonal one they put out last fall "Pumpkin Pie". Dayum, it was good.
Tillamook or Umpqua are both my go-to brands. Hard to choose a single favorite, but can't go wrong with Vanilla Bean. Doctor it up with chocolate as needed.
Seems like every time I go to the store they have a new flavor, which is why I responed as I did. We have White chocolate raspberry , Strawberry, Mountain Huckleberry, and Monster cookie in our freezer right now because it was on sale last week. Can't remember the name of the last couple we got but I believe one of them was Marionberry swirl, and the other was some sort of Chocolate/caramel chocolate chip. My doctor would probably give me a good tongue lashing for my diet, but honestly it is my 125 lb wife who has the sweet tooth in our house... yup, their vanilla bean is pretty great also