Headers vs. Manifolds

I weighed everyone's advice and thought about the power I'd lose and decided to buy some B-Body headers and do the minimum necessary clearancing. Much as I'd like to buy some TTI's, it's just not going to happen. That being said, any specific brands or P/Ns to buy or avoid?
Engine Master did a dyno on headers before and after beating on them pretending to make them fit and loss very little hp, by the end them beat them up pretty good.