From personal experience - the Eizo's are stunning (and IMO go a fair way to justifying their pricetags).
However, if the price can't be justified - have a look at Asus, I believe they released a 24" IPS panel not too long ago. Generally speaking, IPS-panels are the go for editing (it's just a different technology/way of displaying the RBG pixels) - the big advantage of these panels though is their colour consistency and accuracy over extremely wide viewing angles. Most monitors if you bob up and down and side to side will change in brightness/contrast/and colour temp, but this only really occurs in IPS panels at extreme angles. FWIW, the 'Retina' displays in the high-end Apple products are generally IPS panels, and the benefit of buying a non-Apple screen is it doesn't have a gloss finish on it.
I'd avoid Dell's IPS models, but only because I'd avoid Dell EVERYTHING
. Jump onto the reviews for their graphics/editing monitors and read the almost endless stream of negative reviews from customers and you might see why I don't trust them - especially for the amount of dollars being thrown around.
Also - Be aware that if you go with a 27"+ model - most monitors will require a graphics card that has Dual-DVI outputs at a minimum. This is because they can't shove enough information for the ultra-high resolutions down one cable.