Well I don't have my fixed bike anymore but I've got my audax bike with 105, some of which I could move over to a new TI sportive bike but still have the audax to get to work on. Whether I should keep the audax bike as it is and just build up a new sportive bike is what's bothering me at the moment.
This would mean having 2 audax/sportive bikes.
I'd sell the audax, and build up the Ti sportive with a decent range cassette, and a versatile wheelset. You can always get PX to do you a deal with a fixed bundle with the Ti frmae ;)
http://www.planet-x-bikes.co.uk/i/q/FTOOPOMIX/on_one_pompino__macinato_fix_n_mix_frameset_bundle