I use LeadingEdge Plumbing & Rooter, unfortunately, all the time. I've been with them for about five years. They are not the cheapest, but they are reliable and seem to fix things right the first time.

I've used them both for commercial and residential work. They specialize in sewer cleaning and main line repair, which is a big expense typically. They're good guys, and they arrive quickly when they say they will.