Exhaust pipe size

Ok, so i'm pretty sure now that i'm gonna stick with the smallblock anyway, so I think of buying a set of header and to go with dual 2.5".

About the headers, in the affordable category wich one is the best fit/easiest (not easy I know) installation? Hooker/Hedmann/other???
By the way, I would like to keep my power steering and power brake.

Thanks again