I don't see a reason to get RTX 2080 without playing at 1440P or above. Yes you can play BF5 with ray-tracing @ 1080P, but that's only one game. I would get new monitor first. But $400 might not get your all the bells and whistles. I paid $650 for the Acer XB271HU. https://www.newegg.c...N82E16824106004. I can't handle TN panel colors anymore. Its IPS or nothing for me. Which is part of the price.
I found a Dell s2716dg for $300
also i am curious about the nvidia patch allowing freesync