Re: Driving shoes - DJ's house brand, Milana, had some very decent suede driving mocs in store last summer. I don't know if they still have them, but they came in a few colours, including a light brown and navy, and we're well-priced.
Re: Boat shoes. I've got a navy pair and a green pair and I virtually live in them on weekends in summer. Even the good brands are affordable and they are a great casual shoe, particularly in something other than basic brown.