This is a great answer. Been in Philly 20 yrs now. My wife and I lived in DC for years and I still travel down for work. I adore all that DC has to offer but the traffic and cost of living are just absurd. Your 5% percent pay cut will be offset by lower housing costs.

One thing that hasn't been mentioned is the Philly vibe. People here take the Philly grit and spirit much more seriously than you find in DC. Not many people in DC are actually from DC and it doesn't have the working class roots you find in Philly. I love the chip on Philly's shoulder, but it isnt for everybody.