I've got 2 favorites, and I would grab either one for a day afield:
Mossy 835 / Pure Gold .670 / Win XR or HV 3" #6s
Benelli Nova / Pure Gold .670 / Old-White Hevi-13 3" #6s (I have a very nice supply of these shells)

For some reason, I always tend to use the Benelli in the fall, but I'm going to try out using a Stoeger 20 ga. SXS this fall with 3" Federal Heavyweight #7s.