Lot's of good opinions on the Dougs headers here, sounds like you did well there. Good exhaust system for least $$, don't know if I can help you there too much. Have heard some bad things about the Summit branded pipes here so don't think I'd go there to save money, heard nothing but good things about the Magnaflow & TTI systems but wouldn't call those inexpensive. I'm planning on one of those two systems myself when I get to that point with either of my cars because I want to do it once with minimal hassles. I'll be interested to see what others say here myself.
Later, Jim