That price range seems a little on the high side to me. I got a 55" 4K Smart LG TV in the January time frame and was less than $700. I didn't get too zealous with research, but the "smart" part of it seemed to raise cost a lot (aside from the LED, plasma, etc. of the display itself). In hind sight I would have ditched the "smart" on the TV completely (as well as upscaling), since a Blu-Ray player can do both better than the TV can. If you are going to be hardwired to a graphics card, the same would apply.
Others would have to comment on the resolution, since I have seen some reports that "other than 100%" resolution in Windows can still cause issues. But even at 100%, this will still yield significant more real-estate on a bigger area.
scook's placement comment is something also to seriously consider. The "legs" for a typical TV are not overly sturdy, so the TV could be tipped over by accident fairly easily. Wall-mounts are a better choice for survive-ability, but the also go up in price fairly quickly with more motion enabled, require a very rigid structure to anchor too, and pretty much make the TV stuck in one spot (plus mounting will require 2 people if chosen).
As far as viewing distance, I think you can get to within 3 feet or so of mine and still not get "pixilation" (check that out in person at a store before purchase), but the actual weight of the unit may be the part you want to take into consideration most (check that unit weight, and realize it is very awkward to manage solo).