formosanI'd like to say I would go with the CIEM's as im in the market for a pair, but im not hugely sold on the UE Reference monitors. Wouldn't mind the HD700 though.
formosanWould probably go for the UEs. Sennheiser's build quality has never convinced me (crappy paint job on the HD 800, snapping headbands on the HD650..)
Also, My Sennheiser IE8 are starting to fail and I can't use my Phonak PFE232 anymore as they stopped making replacement parts.