Hey everyone, thanks for your replies!
I went ahead and grabbed one of the Samsung 20.1 inch monitors that BB had on sale for 319.
There is a difference in height, but that's okay with me. The additional monitor is just used for email, IM client, network monitoring stuff, etc. Otherwise...
I got my 2407 to replace a dual monitor setup, and of course, as soon as I get rid of the dual monitors, I kind of miss being able to move things off to a "hold" window while I work.
I don't want to get rid of the 2407 because I LOVE it, and I can't justify putting another one on this...