You might want to consider Calgo also. It's a great little rotary system and has jacketed cables (opposing sides), very positive for jacketed cable system. Not cheap like Teleflex though, but either is hydraulic. Calgo is the next best thing to open chain and cable in terms of positive steering (cable system).
Why are there so many dual cable steering systems that have the cables going out the same side? What's the application? How can you adapt these for inboard systems? There is safety in dual cables. But, when they're going out the same side isn't the quality of steering the same? Has Norm made improvements in the stiffness of the Calgo Sys.? I guess Rex is the guy to answer most these questions. One other ?...why doesn't some one build a helm that uses a Morse cable on top and bottom?