Have trashed my last two pairs of Shimano boots much more quickly than I would have expected, so switched to Northwave Celcius 2 GTX (Arctic version if you want more warmth!) – not a lot of stock around at the moment, thought, but I think they have new range boots filtering through. Mine are the standard version and seem warm, but I think will not be overly warm in the depths of winter. I bought primarily for the wet, shitty season, so this suits me and I’m quite content.
My feet are normal-ish width, but they’re certainly not narrow like the Shimano boots were, so you might be ok. Nice and comfy, but not as snug fitting as the Shimano boots they replaced, but for winter use, comfort is king 🙂