Sock requirements also need to be considered. As someone who tries to hillwalk through the year I would need, as a minimum, a thin-sock and thick-sock option.
However, not being someone averse to a bit of gear-monstering, I have four options
. Non-GTX trail runners (thin-sock), GTX lightweight mid boots (thin), GTX full boots (thick) that work well with microspikes and B2's (thick). The latter two are a size bigger than my normal requirement.
The initial outlay is somewhat mollified by the fact that I think the B2's will outlive me and the full boots have and will last me a long while. I go through runners and mids for fun though. Lightweight and comfy tends to mean a much shorter life.