I have a Samsung Syncmaster 950p..its great (but its 19" not 20").
But according to PCWorld, the best 21" monitor is the Samsung Syncmaster 1200NF. You can check their Top 10 list right <A HREF="http://www.pcworld.com/reviews/article/0,aid,47625,pg,2..." target="_new"> here</A>. They update it monthly.
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