"Question: 114%? It has more colors than the NTSC color gamut?"
Yes - it  covers the full Adobe RGB colour gamut which is wider than NSTC. 

Yes Dell do a 30" wide screen - imho too big for most normal use. The resolution is the same as the smaller sizes so requires you to sit further away from it for optimum viewing.  
The studio I go to has one for the print desk, most monitors there are the Dell 24" widescreens which they favour for general work.  They also have an Eizo colour edge 22" CRT which they use for colour critical commercial work . To my eye and that of the studio owner the Dell ultra sharp is the preferred monitor for general use though the Eizo does have a small colour advantage which they need when they have to produce exact commercial colour work for advertising etc. 
LED/LCD monitors can match the Eizo CRT for colour gamut so they are seen as the natural replacement for it when the time comes.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html