The best advice I can offer is to go to your local headset dealer and try them on, I was going to buy a Sennheiser S1 but they sort of "perched" on top of my head, the Bose seemed to clamp my skull somewhat (but less than DCs do) and the Lightspeed were just perfect. It doesn't make sense to save a few euros and end up with an uncomfortable headset.
I've now had my Zulus just over 2 years now and never regretted it, streaming music over bluetooth is a boon when flying long legs solo - something you pay extra for with Bose. Also, Bose service can be a bit "hit and miss", what I've read from forum articles whereas Lightspeed have always been extremely helpful. As for flimsy - I can't agree with that statement, my Zulus look as new....