I know that because of the low q-factor of the cranks some modern derailleurs will not work with them... how true is this really? could I not take a modern triple dura-ace?

My problem is that I need a triple that is also a braze on.. I was originally looking for a mavic triple but I have been looking on and off on ebey for over half a year and give up for now, all the while I have been commuting everyday on the bike. So combined with the upcoming swap and promise of some out of town rides I am ready to get this bike working.

The minimum I am looking for is something simple/clean looking, but of course I would rather something that doesn't look too out of place with the cranks.