Juro, Good to hear about Blue Northern, I still haven't made it there but sounds like it would be well worth the trip.
Another shop that is really committed to a wide selection of materials is "The Bears Den" in Taunton. Nice guys, great selection of natural an synthetics. Closed Mondays!
What about things like hooks, hardware in bulk? I've been using Terminal Tackle out of Kings Park, NY. Anybody have other good sources?