I have 2 different brands and 3 different sizes. That ended up happening as I took whatever monitors I had and used them haha The main screen though is a NEC 30 inch that's color calibrated to the D50 print standard. I need to get a hood for it at some point to prevent the luminous and color values shifting because of the brighter, cooler Samsung monitors I'm using. The top one is a 26 inch 1080p Samsung TV which I don't care too much about its color or brightness accuracy as its for multimedia and previewing a whole body of work in bridge as I edit. The third monitor is a Samsung 23 inch 1080p tv which I use for web, word documents, skype and my tool palette in photoshop. All 3 monitors are also great for when I create 3D lighting diagrams in Maya, and do any web design and video editing.
What I found is a great solution to setting up a workstation is to use cheaper decent TV monitors that I got at costco for the non important stuff and buy one nice monitor that you calibrate for your actual post work.
@emorydunn: Yes, you did motivate me to buy that DVI cable to setup the last monitor haha I shall post 2 pics of my studio in use shooting some simple still lives with the view-camera. I was not showing off or bragging, you got the wrong idea. When I was constructing this system I had a lot of trouble finding good multi-monitor setups for creative workstation. Most of the ones I did find were posted on Macrumors. So, I figured I would put up mine so others could get some ideas if they are setting up a system too, be it windows or mac.