I'm still running the oem lines on my Connie, but I've always run the spiegler lines on all my other bikes, excellent quality and fit!
http://www.spieglerusa.com/brakes/cycle-brake-line-kits.html
My 2009 came with steel lines and has excellent feel, no mush at all. I kinda doubt that they could be improved on.
I am pretty sure the OEMs are steel coated lines. They are quite good.
spielger doesnt havea kit listed who else has them? all i have seen is the galfer