One interesting (if over-priced ) product I tried is the meantime london porter, which if the label is believable, actually is a blend of beers rather than the normal single batch without unmalted (roasted) barley that stouts use. I have found considerable batch variation in it but when it is good it is quite good.
Salopian has a pleasant porter as well. The one thing americans seems to have really taken over is imperial stouts, which afaik they have essentially no competition at all anymore in but many breweries do very well.