In reply to Nicos:
I would not rule out ski club of Great Britain. They do run many off piste and touring holidays. They are well organised but not regimented and based around your skiing ability to ensure all in the group are roughly at the same standard.
Apart from their organised holidays, which are a good way to build experience until you are ready to do your own thing, the club also is a good way to make contact with kindred spirits.
Their resort ambassadors are only in France because of the recent prosecutions of British ski guides. Therefore they have suspended the ski-with-you service there (this does not apply to their organised holidays ) however in the other alpine nations they still operate ski reps./ leaders in resort so members can turn up and ski with them. They usually have a weekly programme which takes different levels each day including the chance to ski with a qualified mountain guide who will certainly give you as much as you can handle in the way of off-piste challenge if you are up for it.
I have skied with the club over many years both on and off piste and always had a great time. Their holidays are not cheap but definitely good value and a good way to build up off piste and touring experience.