JRSMITH :
AMD Radeon :
vote for #1
but i will still put my suggestion
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236288&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=
very popular IPS panel from asus
Should I worry about response time? or will it be unnoticeable from 1 to 5ms?
There is no standard on how to measure monitor response time or even what to measure.
But, consider that 5ms refresh rate cycle represents 200fps, I doubt that your graphics card can manage that.
I would not worry much about that unless you are a professional gamer.