A) People prefer not to use wide-gamut displays like the ones you listed.
B) People have noted special quality concerns regarding tinted or otherwise malfunctioning displays based on the panel in the Dell U2410 and the HP LP2475w. I would read a hundred pages of forum feedback on these and see if you still want to buy one.
C) A particular favorite for people interested in getting a 24" is the inexpensive 23" NEC EA231WMi, so don't discount slightly smaller or larger sets. HP is coming out with the ZR22w and ZR24w in a few days, which are being closely watched as potential contenders for the new 'favorite Eyefinity monitor' crown. The U2711 is another one that people are drooling at.
I run a list
here, the WSGF list on the left side of your screen is mostly accurate & will include non-displayport screens. Adapters are always an option.