Monitor for beefy system?

I have a few options, a 4k display the UD590 from samsung or the new 4k AOC both at 500 pounds.
Or, the LG 34UM65 an ultra wide 34 inch 1080p display.
Now, the idea of 1080p puts me off, but as games get more advanced graphically will i be able to run 4k games on high qualities? (I have a r9 295x2) So do you think 1080p on a 34inch UWHD display will look crappy? (I sit about 24 inches away from my display) and i game and photo+video edit. I know this is all random questions put together but i want a display that will blow me away!

Shoulda waited for some better 4K displays, but I'd go for the 1440p Ultra wide from LG