In reply to GregorySchadenfreude:
Go try loads of shoes on in a shop. Don't feel you have to buy if you don't find one that suits, just keep looking. I have pretty crunchy big toes though I doubt as bad as yours, my usual problem as my big toes won't comfortably curl up tight anymore is the toe nail causes the shoe to bulge, this causes pain and eventually cuts out through the rand before the soles are worn out .
Some of the softer curled up bouldering shoes seem to have quite long big-toe bits, these fit my feet well but as they're designed to load that big toe up as a single point of contact they're painful to climb in. In the end I went for some blue and orange Scarpa TechnoX, these are stiff enough to spread the load a bit away from the big toe but close fitting and foot shaped. I climb harder when I can load my shoes up than in a top of the range whiz-bang shoe that cripples me. Just keep trying them on and test climb in the ones that fit until you find the best compromise.
jk