best monitor for my GTX 750 Ti

I have GTX 750 Ti 2Gb ddr5
my budget is $100-$150
i want 22"-24"
i play CS:go, COD, BF4 and watchdogs

can you suggest one

and what are the difference of 2ms and 5ms?, is it big deal to consider 2ms?

what is my ideal contrast ratio?
can i notice the difference of 1k:1 and 1M:1?