Vienna is the Cadillac of natural casing hot dogs. Nathan’s is a GREAT tasting alternative with name recognition but they’re generally available as skinless only. Since you’re closer to the east coast – how about Sabrett’s? I am sure that the Restaurant Depot in Philly carries them. Now there’s a natural casing dog that has a similar flavor profile and snap as the Vienna Dog. It should have better name recognition in your part of the country. Hebrew National seems to have become VERY SALTY these days.