You are welcome. You have a second thing to consider. Do you want a docking station?
For example the Thunderbolt display is a nice 27" IPS panel like the Dell U2711, and a couple of others that do 2550x1440 resolution. But the Thunderbolt display has docking station features such as integrated speakers, integrated power supply for the laptop, USB 2 hub (which I hope is soon upgraded to USBb 3), and FW (which I personally don't want at all). The closest thing to that package would be something like the Dell U2711 monitor (around $800) and the announced Delkin Thunderbolt dock (announced at $399 but now shipping yet). Note the Delkin dock does not provide a power supply to a laptop.
So I think that despite the big bucks up front, the Apple Thunderbolt display is a good value if....big if.....you want both a good 27" IPS panel and docking station features for a Mac laptop.
I am hoping for a Thunderbolt Display refresh before the end of the year. I don't know if they will increase the resolution to "Retina" levels (whatever that would have to be on a 27" panel); but I would expect the upgrade to USB 3 and maybe dropping FW.