Best Sport/Workout Case?

[aviduser]

I would like a sweatproof armband style case for my N1. I will use a Bluetooth headset, so no need for a wire opening.

Anyone have one that they would recommend? I want one that is pretty water tight--not submersible, necessarily, but able to keep my phone dry while strapped to a profusely sweating arm.

Cheers,

aviduser