I'm center-cut street 43. My three pairs of TC Pro are {42, 42.5, 43}. My main ice boot for many seasons is the silver Trango, size 43. My Spantik is size 44, which allows me to wear a thick sock over a thin sock, and to still have generous circulation and wiggle room.
I'd think you'd be best in 44 or 44.5. If your application is more technical ice, go 44; if your application is expedition/high altitude mountaineering, go 44.5.
I will plug that I would be willing to sell my size 44 Spantik, which is in great condition.