There is a huge difference in the technology offered at 1080p and 1440p.
At 1440p, IPS panels exist w/ G-Sync / ULMB, they don't (at least i have not seen any) at 1080p. This is where all the attention is at present tho the price tag is still high at $700 for monitors like the 144 Hz Acer XB270HU bprz and 165 hz Acer XB271HU bmiprz.
The closest TN sibling that comes close to your budget is he $500 Acer XB270HU Abprz
http://pcpartpicker.com/part/acer-monitor-umhb0aaa02
I know that's $200 more than you wanted to spend but once you drop below that, it's a big reduction in technology / performance. Normally I'd say spring for the IPS panel but that monitor is normally $600. At $100 premium for IPS, I'd find a way ... but at $200...