Car cover?

Hi-
I have a 68 Barracuda fastback.
I recently moved to a building that has a covered, "open air" parking garage.
Car is on first level...not near any of the openings.
I'm near the water in Fort Lee, NJ.
Recently we had some crazy fog roll in and my car was drenched in condensation.
I took it for a ride to dry it off, etc...but am worried that during winter months it will rust.
I've heard pros and cons about car covers.
Need advice on if I should get one..and if so, which one do you guys recommend?
Car is never stored outside.

Thanks in advance!
Rick