I have the copy of the DC sports header... To be honest, its not great. I have gained torque in low/mid rpm. but my overall 0-100 time would not be affected. Daily drivability is better though. I also just replaced my flex pipe for $120.
In my opinion, wait for second hand toda/maximworks headers to come up, and get a set of those.

At this moment, I would get that whiteline RSB, as it actually worth the money!

People have a tenancy on this forum to exaggerate performance upgrades for the euro. handling is something that is worth the money imo.