I've been using the
Kent Pro Scraper. It now comes with up to a 36" fiberglass rod handle. I think it's the best scraper I've ever used. The only addition you need to make is to purchase the stainless steel blade if you have a glass tank, with that blade, you can easily take anything off the glass.
As far as magnets, I had a bad experience with a cheap set where I picked up a piece of sand, and didnt notice it until I had scratched my glass tank. It wasnt the magnets fault, but I stopped using it.