In reply to Misha: Might be worth checking
http://www.ice-fall.com/ nearer the time for up to date conditions.
Arolla is high so is a good choice as Frosty says (probably worth checking his blog as he is the man on the ground!). If I have been out in the past for a cascade mini break I have based myself in Briancon which means you can drive to La Grave, Cerviers, Cellaic, Embrum, Les Orres, and all the major valleys close to Argentiere le besse.