Best wet-weather hubs? Mid-range Shimano like 105 and LX. As good as anyone needs for any application. These hubs have double seals on the non-drive side and the best freehub design of any hub on the market.
Replacement parts are plentiful and cheap, mostly for free from wrecked wheels scrounged from the back of your local shop. I've been wheel building for 15 years, and I cannot remember once paying for a (plentiful) supply of replacement cones, freehubs, bearings and axles. Not that I need them very often; these hubs take a lot of abuse.
I have dozens of new hubs in boxes in my stash, including Hope. If I'm building wheels for myself, my first choice is Shimano.