I have setup multiple multi-monitor stands. My first stop would be here:
http://www.wsgf.org/Skip, the guy in charge there, has been a fountain of useful information for me. They also have a store and if you contact Skip he should be able to get you anything you might be looking for. Also the stands he sells can be upgraded, and he sells the upgrade kits too, in case you later decide to add more monitors.
The Ergotech stands are just amazing. They can easily be set up by one person, and the feature of being able to first mount the slim VESA bracket on your monitor, and THEN lock the monitor onto the stand in position with no tools, is easy to overlook but a massive help over trying to screw things in while holding the monitor up, like other brands would have you do.
-And the Ergotron units can mount 27" monitors. If you ask Skip he can probably get you a picture to show you what it would look like.