Can it really be that the D800 has less weather sealing than the D300? I use the D300 (and the D2Xs) with 80-200 AF-S for hours in pouring rain frequently during the monsoon season, and I've never had a problem. If the D800 can't take this kind of abuse, what then with the D600 and D7000?
It's unfortunate that information from Nikon regarding weather sealing is rather vague. With cameras like the D4 and F6, it's another story since they show them soaked in the brochures, but what lenses can take a shower is partly guesswork.