We lived on the beach in Hawaii and always had the windows open during the day to take advantage of the trade winds. When we left 4 years later nothing electronic seemed to be damaged. My outdoor grill was trashed but my 50" plasma tv just inside the sliding glass door was functioning fine.
YMMV OF COURSE!
I wouldnt let the ocean stop you but I wouldnt go overboard when buying a PJ. none of our computers were damaged by the salt air but the cooling fan sucking in that air on a PJ would give me puase before spending money on an ultra high end PJ.