Header coatings, how necessary?

My '70 Duster w/ built 360 currently has a set of Hedman Tight Tubes headers which work OK but the downpipes I had made by a local shop back when I was rushing to get the car together are pretty crummy now (crushed, leaking, etc.). I took the car to a specialty hot rod/racing exhaust shop and to have new downpipes made up would cost around $420. Just to be sure I checked Summit and a pair of bare uncoated Doug's headers are around $460, so I think I'm just going to go that route as I'll get more performance in the end anyway.

Now my question, are those fancy ceramic coatings worth the extra $150+? I read a thread on here about using high-temp BBQ grill paint on raw headers and several members have had great results, I wouldn't mind doing this at all. Also because I live in a pretty dry climate my current headers (which I've been running for almost 2 years) have almost no rust and they are completely bare as well so I feel like it would take several years for them to build up any serious "structural" rust.