as long as the headers can get the exhaust out of the engine there's no issue. imo the worst thing that could happen with crap headers is they crack and you have to replace them = more money.... other than that his biggest concern, on that end, should be getting a properly sized and good flowing exhaust to match what the engine is doing
the reason guys are busting your balls is because most people come in here and talk a lot of talk and never do **** to their car.... just the nature of car guys i guess. but you're getting it done and you're gonna get some mad respect for it; not all of us may like the end product of your car but at least you're starting in the right ****ing place and you seem to have your head out of the sand compared to most people who want big power out of this engine