Go with these guys! Stoltzfus and Sons (
Stoltzfus & Sons Builders - Roofing, Re-Roofing, Roofing Repair, & Exterior Renovations).
Amish crew of five (father and two sets of brothers). Did my roof in Chester Spring a few years ago for 25% less than the next nearest bid. In and out in a week, there every day, drove a magnet around my driveway at the end of every day, replaced several sheets of sheathing, and were outstanding to deal with. Stephen Stoltzfus is the son who does the estimates. Highly recommended!
Funny about the Amish. They won't drive (used Christian drivers), but jumped out and got on their cell phones as soon as the trucks stopped.