I have Quest 10s and I'm always a bit afraid of all the problems people have had, really no way to know what's coming. Based on all the reviews your seeing(when I got mine there were few people who'd complained) NOW, know what your risk is buying them.
Impact 10s and Quest 10s should fit similar I think, Impacts don't have all the same problems, and don't have a tour mode, so if that doesn't matter get Impacts. I don't know about the Lange boot. It'd be best to just decide if you wanna risk it with Quests, or get one of the other kinds, and talk to the boot fitter if you're getting one of the other two.