I got a Dell S2716DG 27" 144Hz G-sync monitor for $350, so I did pretty well. It's admittedly a TN panel, but man, TN has come a long way in the past 10 years; viewing angles are pretty great and to my eyes it looks better on still images than my IPS Korean QX2710. Confirmation bias, perhaps, but I'm happy.
It also has extremely slim bezels; looks positively tiny next to my old 27" Korean monitor, even though the screen area is identical.
My next monitor will be a 4K OLED super-wide crazy beast, but the Dell will last me for 2-3 years no problem.