In reply to Kai Autio:
Aluminium crampons aren't really suitable for hard ice and rock. You might get away early season, if on hard snow only but if you encounter hard grey ice you'll totally regret it!
The steel Airtechs or better G12's or similar will cope with most things. ALU crampons are designed for ski mountaineering on snow and for early season snowy approaches to rock climbs when you need to carry the crampons on the route, as long as it's not mixed!
Camp do a light steel Nanotech crampon but not heard any proper reviews on how they fair for general Alpine mountaineering.