Kevgarlic

I use SmugMug.  I've been very happy with the ease of use and support.  They offer several plans, but you will need the "Portfolio" plan or higher to create price lists and get set up to sell.  The top plan offers the ability to apply different price lists to different photo galleries which would be a nice feature to have, but I don't sell enough yet to justify the difference in plan cost.  I purchased a domain name through Go Daddy so that my web site address doesn't have "smugmug" in the URL.  It's easy to set up but maintaining your own domain is an additional cost.  There is a forum at https://dgrin.com/ that may offer some additional info.

B&H currently has a $200 instant savings and a 4% reward for the 200-500 5.6. I don't think you can get a better deal than that. 

While Scott has given you good info, you do not indicate which lens...a high end body like the D810 can show flaws in "lesser" lenses.  You list the focal length as 44 so I am assuming it is some zoom...

Welcome to the forums.

Which lens did you use? Could you share the EXIF data? What raw converter do you use?

Most lenses vignette, and the high-res bodies show the vignetting more than less demanding bodies do. Correcting vignetting in post is trivial and most, if not all, raw converters have lens libraries so you only need to activate the correction to get rid of it.

If the aperture was closed down a bit more in the photo of the building, that would explain the degree of vignetting visible.