Choosing new 144Hz monitor on limited budget

[Onyxacek]

Hello,
I'm looking for a decent monitor on budget. I currently have BenQ GL2460 which I guess works well enough, but I want a second screen. Some time ago I bought another one (a bit newer) and I had it for a while. It was 1080p and 23.8" which bothered me and I sold it to one of my friends. Now I hunt for something like.. better than I have. I'm aiming at 144 Hz monitor which is also bigger than 24". Problem is, that I read about low PPI with big screens and 1080p resolution. Now I really don't know which one to get. I've got i7-8700k with GTX970 and I'm worried that if I bump up resolution, I won't get such a great performance anymore coz of my GPU. I'm also kind of on budget. I'd like to stay under 300 (400) usd which is under 8000 CZK. I'd also like to ask if I would really notice if I aimed for G-Sync. I found AOC G2460PG to be in my budget range, but I really hate green color, since I matched everything on my desk to black/red theme.

Thanks for all answers.

These caught my eye:
Acer Predator XB240HBbmjdpr
Acer KG271Abmidpx
MSI Optix G27C2
MSI Optix MAG24C

 

[ArchitSahu]

1080p, 144Hz:
PCPartPicker part list: https://pcpartpicker.com/list/hqXRLD
Price breakdown by merchant: https://pcpartpicker.com/list/hqXRLD/by_merchant/

Monitor: Asus - VG278Q 27.0" 1920x1080 144Hz Monitor ($298.89 @ SuperBiiz)
Total: $298.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-16 21:05 EST-0500

Performace will not be affected greatly unless you are playing on that as well. If you are only doing web browsing or light videos on the second monitor, it should be okay