depends what your looking for.
if you have the gpu power, i would recommend a 120hz monitor.
this one is very nice if you can dish out the extra cash for it
http://www.newegg.com/Product/Product.aspx?Item=N82E16824014270
i wish i would of gone with three of these.
if thats out of your price range
i have three of these and they are great
http://www.newegg.com/Product/Product.aspx?Item=N82E16824236103
good price on them too.