If you get water in the car you either have SCARY rust problems $$$$
or you need your rubber sealings replaced. Denmark gets its fair share of rain too and I don't get water inside the cabin. Knock on wood.
I'd say keep the SC and commute with it during spring and summer. For winter you could find yourself an old Golf II or similar (to avoid rust on the 911). They are cheap to buy and very very cheap in parts and upkeep. This winter I've been driving around in a 1989 Golf II Diesel with 309000 KM's on the counter. It's a beater, but it starts and runs ok. It drinks quite a bit of oil, but nevermind that as long as it goes.
BTW the guy I bought my Porsche from got himself a TT Coupe 225. He had it for a year and then gave it back to the dealer. The car was nothing but trouble.
What's a poof btw? (At work, no dictionary within reach)