More brainstorming as dates become booked up and I'm left in the cold!! I'm not ruling out estates outside of Philly now. This one is gorgeous.
http://www.elkinsestate.org/
UPDATE: The ballroom needs work. It basically looks like a barn!!! And this photo is actually of the amazing lobby, which is BEYOND awesome! But the lobby is only good for cocktails- not a full reception. So, I must scratch this estate off my list. There's no way I'm dancing with my new husband to our first dance under wooden rafters! It's always been my dream to have a chandelier with a pretty ceiling.