Hey guys I want to buy HD LED monitor for Gaming. My budjet is around RM400 -RM500. Can anyone guide me and tell me which 1 is the best?

Acer 24" K242HL S1 Series Ultra Slim Full HD LED monitor VGA + DVI
ASUS VS228NR 21.5' Full HD LED Monitor with High Contrast Ratio
Acer 23' S230HL S1 Series Ultra Slim Full HD LED monitor [VGA & DVI]

I don't need monitor with speaker. Usually I'll use lelong.com.my to buy items so if anyone found the best monitor LED HD preferably 21.5" - 24"> please do tell me about it.

Is this a correct thread to ask question about monitor

Last question
Should i buy
Asus Monitor LED 21.5' VS228NR
or
Acer 24" K242HL S1 Series Ultra Slim Full HD LED monitor VGA + DVI ??
I want the best performance