Vixen do make a Water proof 16x as well - [US link below]. You are correct in the 30x size as well. The Celestron 15x70's are 'reasonable' astro binos again they are Multi coated 'only' and are not FMC- they do get mixed reviews just make sure they are well collimated.
Good luck in your quest.
http//www.opticsplanet.net/vixen-giant-waterproof-16-x-80-bcf-binoculars.html