In reply to wardyuk:
I went with a Geographic Bureau organised trip up Elbrus about 8 years ago. Everything went very well, they were professional in all respects from start to finish, particularly our guide - who was called Gia. I've no hesitation in recommending Geographic Bureau. Go for it! A few years later I also booked with GB for a trip to Mount Kazbek in Georgia, again they carried out a very good job.