Since you asked...
Mid County Mustang
in Upper Uwchlan, PA (about 45 minutes west of Philly) is absolutely awesome for rust and body repairs. I do not know how they do on body shop type stuff, but they specialize in floor pan, inner rocker, frame rail replacement. They will do anything, but they do rust repairs most of the time.
Their price is very reasonable. They will give you a written estimate that is good for 90 days. My rust repair was around $5k and they only ran over by $100 from the original estimate and that's because they found some hidden rust. They called me and asked if I wanted it repaired.
I took my car to Glazier's as well for a quote. I saw some of their work. Absolutely awesome. They are a little price for rust repairs though, they were about 3-4K more then Mid County. Glazier's struck me as a better place for body/paint/restoration and Mid County more for Rust repair.
Slade & The KaStang
200 CI, T5, Comp Cam 260H ,Dual Exhaust Headers, OZ 250/2V head, Holley 390 4V, DS2 Ignition w/ MSD Digital 6+, GT 5 lug disc brakes, 8" rear end, V-8 Steering
5.0 EFI with Megasquirt, BBK SSI intake Manifold, Trickflow TW170 AL Heads, TF Stage 1 Cam...and a quiet as hell exhaust. Want it to sound like an I6...
"It's not how fast you go...but how go you fast"