I am thinking of buying a wide angle zoom FX lens for better landscape shots. I am tossing between the Nikon 16-35 F4 or the 17-35 F2.8. I'd have loved the 14-24 but with it's bulging front attaching filters is impossible (I use multiple filters for landscape shots). Really the options for wide angle zoom FX lenses seem to be limited. The 17-35 is more expensive due to the constant F2.8 factor whereas the 16-35 gives me an extra mm but the F4 factor is a bit - however for landscape shots I hardly go below F4 anyway.

Thoughts...suggestions...please...