i have the do not get acer :< . turning off post processing has helped to alleviate the input lag so its not so bad i guess. but i recommend against this monitor as i got it only because it was the only cheaper 24" 120hz available where i live.
has anyone tried the new samsung 24"/27" 120hz monitors? i had a friend who bought the S23A750D (http://www.newegg.com/Product/Product.aspx?Item=24-001-475&SortField=0&SummaryType=0&Pagesize=100&PurchaseMark=&SelectedRating=-1&VideoOnlyMark=False&VendorMark=&IsFeedbackTab=true&Keywords=%28keywords%29&Page=1#scrollFullInfo) and tested at my place. the colours look really good for a tn panel (granted its glossy). the only downside to it is you'll need display-port to get 120hz on this model/series as it does not have dvi.
the other model/series (http://www.newegg.com/Product/Product.aspx?Item=N82E16824001473) though has dvi support but has this weird design that i'm not a fan of.