In reply to aldo56:
Recently bought the Scarpa Rebel Ultras. Incredible so far, best fit I've ever had in a boot and I tried on a lot recently. Only used on indoor ice and mixed so far but expectations are very high for the coming season.
They are very supportive and like you I was going from a fairly solid b2. The difference was night and day. They also feel warm enough to me, at least warmer than my b2s and they were fine for Scotland and the Alps.
The main reason to get them is probably the weight. They feel ridiculously light and low profile so they allow you to use your feet more like you would when rock climbing.
Tiso just got them in stock and you can get them for about £395 with their outdoor experience card discount. Not cheap but it seems that's what you pay these days and you definitely get what you pay for with these.