I have used Invernos (Vega's in Europe) and Salomon Mountain Guide 9's, and now have a pair of Scarpa Alpha's.
The Inverno's felt and climbed like I was wearing a pair of flippers, whilst the Salomons were f'ing cold!! (Got serously cold feet once and threw them away once I got to the valley). The Alpha's are the best of both worlds. Light, water-tight, climb well and warm (feet often sweat and stink by the end of a long day). Make sure they fit your feet though.