I use an Ergotron Workfit-S: http://www.ergotron.com/ProductsDetails/tabid/65/PRDID/378/Default.aspx http://www.ergotron.com/ProductsDetails/tabid/65/PRDID/378/

I use an Ergotron Workfit-S: http://www.ergotron.com/ProductsDetails/tabid/65/PRDID/378/Default.aspx http://www.ergotron.com/ProductsDetails/tabid/65/PRDID/378/D... It's very quick to move up and down, and the keyboard tray and monitor are independent. Not much adjustibility on the monitors, but otherwise I have no complaints.