Mkay how did you do the saturation test in photoshop?
Take a picture of the screen using a white background. Make sure it's not blown out (too light) or much darker than what you actually see in front of you. It doesn't have to be exact, and it most likely won't show any tint anyway, just get as close as you can.
Now, in Photoshop, load the picture and press Ctrl + U. It'll bring up the hue/saturation controls. Bump up the saturation and, like magic, if you've taken the photo properly, any tint issues you see should pop out on the photo.
Keep in mind that, even if your screen has pretty good whites, you'll still see a tint of some sort. You're not so much looking for that as you are looking for any major differences between different areas of the screen. If your white background is uniform then any tint should be pretty uniform too. If one part of the screen is tinted differently from the rest then that should show up as a different colour like green. If one area is brighter/darker then that will show up as a darker/brighter colour etc. It's just a way of magnifying the problem you see in front of your eyes.
My advice to people who don't see any tint is is not to go looking for it
If you've got a screen that has it badly it'll be perfectly obvious to the naked eye anyway, without having to go looking for it
Are you getting another u2410?
I opted for a refund and will likely buy another U2410, yes. I was very happy with its performance. If Dell could get these green/pink tint ones out of the channel then there's very little bad I could say about it. If lightning manages to strike twice, in terms of bad luck with any issues, then I'd only take a look at the LG 26" IPS instead, which hopefully OC will do for under £500. I'm sure there's some other stuff on the horizon which will use IPS, but it doesn't seem like much of it will arrive this year, and I'm not in the mood to hold out another year