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?
The Hedman 78030 fits nicely with a few minor dings . manual steering and a mini starter is needed.