I have an LG ultrafine 5k, and a cheap BenQ 4k. The difference is night and day. I hate the BenQ* and will dump it as soon a I can.
My suggestion is to hold off until you can save up and buy one of the suggested displays when it's in your budget.
* The BenQ has a matte finish which effectively blurs everything, e.g. it's like it reduces the resolution by 10-20%. The colors are not accurate to my macbook display, despite trying to color calibrate. The brightness is dimmer as well, or looses contrast if I make it bright. Built-in speakers sound awful and volume cannot be controlled by software. I could go on.
