well it depends on your budget. If you wanna go for the high labels, TODS makes beautiful boat shoes. Ralph Lauren too. However, they cost a couple of hundreds. i saw one at TODS costing 599 or smth like tt. Ralphs cost around 300+ if im not mistaken.
If you have a tighter budget, try vans. they have boat shoes not more than 90.for even lower ranges, probably you shld visit Far East :]