Will you use a road or MTB front derailleur for your 27/43 combo?
Funny you mention that as I have read about people using road derailleurs to save some weight. If I did go down that route I'd have to make sure a certain component would work with my top-pull setup e.g. Carbon-ti make a small adaptor that converts a down-pull road derailleur into a top-pull.
If I did go mtb, I'm considering a braze-on Sram XX with a carbon clamp.
At the moment am looking at 42/26.
Thanks for the pic also, SpeedyChix. I think I've come across you bike pics before but at the time wasn't considering this kind of setup. Good to know.