I'm not particularly fond of Paragon as a store because of the huge amount traffic and the hipsters at most of the sections but the snowboarding dept is pretty solid. A couple of the guys there are knowledgable and really attend to you. I stop by if I'm in the area and talk about the conditions in the area and see what new stuff they got. I got my girlfriend a pair of boots there last weekend and they hooked her up and let her walk around the whole store in a couple of pairs of boots to see which fit the best.
For all my stuff I usually I go to Gilly's Snowboard Shop in Pittsfield, MA. Its a good drive (~3 hours from the city) but my brother goes to RPI so I always make it out there when I pick him up. B.Gilly on the forum here owns the shop and I've never had a better experience at a snowboard shop.