Agree totally with mrfish...

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"It never gets easier, you just go faster..." - Greg Lemond

"Because technology alone is a poor substitute for experience." - Richard Sachs

I have not found one headset or bb that is waterproof.
Sealed means not sealed from water they are sealed from dust but to a point.
You still need to service them.

They all end up the same way some sooner then the other.
You need to keep up with the grease if you do a lot of rain rides.

Or if they made some ceramic races and bearings you would not need to worry about rust.

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I never took drugs to improve my performance at any time. I will be willing to stick my finger into a polygraph test if anyone with big media pull wants to take issue. If you buy a signed poster now it will not be tarnished later. --Graeme Obree

Dura Ace 7410 headset is pretty nice, cartridge bearings but looking on ebay they are stupid expensive. With that being said I would go with a King.