I'm not sure if it's a consideration with Nikon cameras, for the Canon top of the line lenses were almost all the same ring size (77mm IIRC). So I started out with the cheaper lenses (with much smaller and varying ring sizes), but bought 77mm lenses, expecting to upgrade. You can get a step up ring to attach the luxury size filter to the cheaper lense, then re-use it when you have the better lens. Also, allows you to buy one filter for several different size lenses.
Speaking of lenses, what's anyone's thoughts on Tamron?
I know they won't compare to the best Nikon or Canon lenses.
I'd like a longer zoom for birds and wildlife, but don't want to spend $3-4K on it.
Looking at the Tamron 200-500 Tamron AF 200-500mm f/5.0-6.3 Di LD SP FEC (IF) Lens.
Pretty decent reviews.