The best 1440p monitor?

I am in the search of a nice 1440p monitor or even a 4K monitor. I am looking at Korean montiors and major brand monitors. I want a good color accurate, low response time for gaming, and little to no back-light bleed.Could any of you list monitors that are below $400 and maybe a few above $400 for a comparison?

I am nervous about buying a Korean monitor so any facts I should know about them would be great. I have been looking at the 

QNIX QX2710 LED Evolution II DPmulti TRUE10 PIVOT 27" 

BenQ BL2710PT 27"

and a refurbished ASUS PB278Q 27-Inch WQHD

Any recommendations about these monitors or others would be helpful.