I've used polarized glasses for years and find that it's really helpful. I suggest you make sure to buy sunglasses with glass lenses and not plastic. I've had my Maui Jim polarized glasses for seven years now and they still look brand new.
The one I use is shown in the link below.
http://www.cabelas.com/cabelas/en/templ ... &noImage=0
Which lens colour? Depends on whether you will be fishing low light conditions. If you do then amber lenses will be a better choice. I prefer dark lenses since I use the same glasses for driving etc.
In India, polaroid makes polarized sunglasses and they are quite good. If you fancy ordering it from abroad then there is a huge selection available at discounted prices, check the link below.
http://www.notallowed.com/d/1338 ... asses.html