Ok, So I'm in the market to add some screen real estate to my 2011 13" MBP in the near future as I'm going back to school and would like to have as many pixels as I can afford. I'm currently looking between the 27" Thunderbolt display, and a 21" iMac in Target Display mode. The Thunderbolt display adds a whole lot of pixels to the mix, and I would use the MBP in Closed Clamshell Mode and drive the display as the sole display, but the size may be prohibitive as it may be a bit big to fit on my desk. Adding a base model 21" iMac will allow me to completely devote my 2007 Mac Mini to server duty, retain a desktop for those times when I don't feel like pulling my MBP out of my bag, and in reality, for only $200 more, I add another computer. I need to get into an Apple Store and look at both of the options in the store and try to decide which route to go. Currently, I'm using a 19" Acer monitor that runs at 1440x900 when I'm at my desk. When I get back into school, I anticipate that the extra real estate would be useful... Any thoughts?