Take a look at the HD NANO series filters. Great Value. Link below. The new coating process created a top layer that is more scratch & stain resistant, and water & oil repellant, making it easy to clean when smudges and fingerprints are introduced to the surface.
I think these HD3 Hoya filters are the best made. I am putting them on all my lenses. A bit pricey, but if you are buying great lenses, why not the best?