If you have a problem with your boots, I highly recommend you check Nike, their product is seriously underrated.
Sorry, but I think your current boots had nothing to do with getting injured - if you get injured on mountain, its either your fault, or someone else's. Sorry man, but at least nobody else was hurt, the only thing worse than doing it to yourself is including another, you never know how thats going to wind up
Fingers crossed you don't take too long to recover! Watch out for Buller too, when it gets windy, the Summit and main runs get stupid icy.