I'm not saying the TBD is cheap, but I don't follow your recommendation at all. The equivalent Dell 27" display is $849 vs. $999 for the TBD which includes Thunderbolt for a one wire connection to Mac portables. Just having a clean setup with only one wire to unplug is worth the $150 to me. Plus you can get a refurb TBD for $829. So its not like the TBD is $500 extra or something.
What is the Dell equivalent monitor in your eyes?
In EU, the U2713HM is about 540$ and Apple TBD is about 900$ which is quite a large difference.