I'm a big fan of the 34" gaming monitors that you can find for under $300 USD. I've been upgrading many of the gaming computers on my LAN with these from LG, ASUS and others. I'm also upgrading the seating, but you appear to have a decent gaming chair. I think your current video card can handle the 1440p 34" gaming monitor with ease.
As Albert Einstein said, "I could have done so much more with a Big Al's Computer!".