Are Doug's headers worth it over my Summit headers?

I currently have summit headers that are brand new.. but what a PITA to install and the fit leaves a lot to be desired. I'm building a new 408 with ported heads and ported air gap intake. Is there benefit to be getting these Doug's over what I currently have? I love the looks of the Doug's and to be quite honest looks goes along way with my car so the summit heads although are black I'm nervous they will rust over time. What Doug's headers do I need to squeeze out every last drop in HP over the Summit's headers? I saw some on summit;s site for $800 and saw some for $500 which ones do I need for my 68 Dart with a 727? Any particular place you would recommend buying them from as far as price goes?

Jason