The Dell is an IPS monitor which is why it garners the price tag that makes it twice what you see on typical TN panel monitors. It's an outstanding monitor. My son, a photography student and avid gamer, uses one.
I would go with the U2410 and the problems they had were when they first came out but their fine now I have had mine a year and I think it is the 4x4 of monitors and it come calibrated in the sRGB mode .
Ya I had the original and it was a little funky sent it back when the new revision
came out and it seems as fast as any TN panel I have ever owned plus if you need to send it back they send you one first and you put the old one back in to the box.