Hedmans are the first ones that I would go with...
To many horror stories about Flowtec the ones that Summit and Jegs carry that have their brand on.
I just bought a set of Hookers for my 81 Dually from Advance Auto.
Their price was better than Summits when you use their discount codes.
I got the headers, clamps and hangers for less than a set f Hedmans were through Summit.
I agree TTIs are nice but priced out of sight.