It IS getting hard to find large standard aspect ratio displays. Newegg does sell some high-end standard aspect ratio displays ... here's a couple of 21.3" units (which will give you 13% more display area than a 20" unit):
http://www.newegg.com/Product/Product.aspx?Item=N82E16824136049http://www.newegg.com/Product/Product.aspx?Item=N82E16824002361