Had several pairs of custom Whites and they were always too small. Gave up and bought off-the-shelf Redwing Heritage. I like those for everyday use but on rough terrain I wanted more support. I tried Irish Setter (cheap), Hanwag, Zamberlan, and Danner. The last three are worth looking at. I've included Goodyear welt and Norwegian welt boots, so if you're looking strictly for stitch-down, there are fewer options, most of them custom. If by stitch-down you simply mean not glued-on EVA soles then these are all applicable. FWIW, I found some Norwegian-welt Zamberlans that give me a lot of support compared to the Redwing Heritage, almost crampon-compatible level of support but they're not absurdly heavy. They have a Goretex liner but no heavy insulation and they're ~6" so they should compliment your winter boots but not replace them.
How are Custom built shoes too small?
