Yea it's a bit of a tough call for me. Either i get a lower res screen but I get TB and IPS, or loose both of those for a TN with extremely hi resolution. don't know what's better really. Doesn't seem like Apple is going to provide a solution anytime soon.
The Dell 32" 4k is around $2k at B&H at the moment, price on that bad boy is cheaper than an 1600P NEC or Eizo.