ok, if you monitor can do 60Hz, that means it can refresh the image 60 times per second. if your gpu is doing more than that it may create tearing (where the screen is trying to show two images at the same time).
You can get 120hz monitors (that are meant to be a lot smoother even in the desktop) here every frame up to 120fps will be shown.
120hz monitors are also typically 3d capable.
Your proposed monitor is 60hz regardless of resolution (often lower res support higher res, mine hits 75hz at lower res for instance)http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007617+600255030&QksAutoSuggestion=&ShowDeactivatedMark=False&Configurator=&IsNodeId=1&Subcategory=20&description=&hisInDesc=&Ntk=&CFG=&SpeTabStoreType=&AdvancedSearch=1&srchInDesc=
this isn't the best example of screen tearing but you'll get the idea, imagine it on an fps, where would you aim? some games don't suffer as much as others. http://en.wikipedia.org/wiki/Screen_tearing