Right across the river (the brandywine that is) is Colourworks. They have been around almost as long as buckley's has ; but since buckley's closure they overtook their film processing (and clients). I took some 4x5 slides to them, and they came out excellent. Besides, they even list 11x14 sheet development on their price list, so how bad can they be .
Buckley's went out on April 1st.

Granted, the website doesn't seem to have been updated in over a year, but the contact info is still correct.

Not sure how we've missed each other up until this point, but I live in the brandywine hundered area. Gimme a shout sometime.