If you're not going to run 4k content, don't even bother with the 4k TV... you're going to stress your videocard for nothing.
That monitor is basically a 2x1440p into one. Just make sure it will run off HDMI, I've only seen Thunderbolt versions of that.
OTOH, 4k TV prices are dropping like flies. You can buy a 60" 4K Vizio for ~$800... I've just seen a 55" at Target for like $600.
I think there's going to be great deals for them come Black Friday if you wanna wait it out.
Don't really have experience with curved monitors, but I've been eyeing the same thing to replace my dual 27" 1080p samsung monitor setup.
We do already have a separate 60" 4K TV for working with that content.