I've been on 9 caribou hunts, 3 in Quebec, 1 in NWT and 5 in Alaska..
Quebec has a lot of outfitters , some good, and some not so good, as the poor guys who booked with Tuttilick last year can tell you..
I would highly recommend Jack Hume Adventures...They are very honest and well organized... They have thier own airplanes ( important) and WILL move you if necessary...They do thier best to get all of thier hunters into caribou and are usually successful in doing that.. The've been around for years and thier reputation is as good as any in Northern Quebec,and better than most...
A friend of mine has hunted with Hume 10 times..That kind of repeat business speaks for itself...
www.jackhumeadventures.com