I had a chat to Steve Hamilton over at Eizo who called me back and was very helpful. Basically you CAN set up a profile for web work using an sRGB profile, colour temp of 6500 etc. along with a couple of commonly used printer/paper combos and flick between them. When I asked about why a Dell couldn't emulate a printer/paper combo as effectively the answer seemed to be more around the even/consistent reproduction of tones, saturation and brightness rather than anything. So I think basically the answer is, that if you buy a wide gamut screen it will do the job, probably to a level that most will find adequate. And even then you can fix issues with some test strips/prints.
I'll probably get an Eizo soon, mainly because dealing with Dell over the last week has been painful, and I can be confident I'll have everything set to perfection, it's excellent local support.