Binoculars Choose Size

I need help choosing binoculars.?
NcSTAR Full Size Binocular – 20×70 Binoculars / Ruby coated
http://www.opticsplanet.net/ncstar-full-size-binocular-20×70-binoculars-ruby-b2070r.html
Nikon 10×50 Action Extreme Waterproof Binoculars
http://www.opticsplanet.net/nikon-10×50-action-extreme-binoculars-7245.html
one is much more magnification and clarity 20×70 rather than 10×50 but its not waterproof and requires a tripod (being so good) and has a ruby coating.
how important is waterproofing if its just for a regular first time user.
http://www.opticsplanet.net/nikon-10×42-monarch-binoculars.html
Go with the Nikons you picked or the smaller ones that I picked that are great carry binos.
Rely on Nikon for quality…….The only optics that are real good cost lots always……there are no cheap super optics……..
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