I have a 24" and a 20" monitor I would like to put on an ergonomic stand of sorts, eventually I would also like to be able to handle dual 24" monitors with this stand.  For now the 20" would be in a vertical orientation.
 
Any suggestions?  I've seen quite a few stands by Planar and Ergotron.
 
I would like the height to be adjusteable, and am looking mostly at the Planar AS2 997-5230-00.  Any suggestions would be more than welcome!!