CBreezy is right about IAD and TransStates. I worked there for almost two years following the Delta shut down of Comair. While I did leave, it was for QOL issues. I didn't want to commute to ORD as a reserve captain. Last I heard, the IAD CP is a former Comair pilot.

If you decide to look at PSA, a commute to any of the crew bases from DCA is feasible. If commuting is something you feel is absolutely necessary, I'd consider CLT, then DAY. My last two years at Comair, I had to commute to DTW in order to remain in the left seat. If I couldn't get on the jumpseat, I could drive. That said, I hope you live in VA toward RIC. That makes CLT better than DAY.

Your location in the DC area makes PHL a viable option. But having lived in Northern VA for nine years, dealing with the road traffic might make commuting a more attractive option. Good luck!