If you just want a 23-24" 1080p IPS monitor, the
ASUS MX239H, which is the one I have, has exceptional color reproduction! I recently set it to "Splendid" and holy WOW are the colors more vibrant than I've EVER seen!
Also, this monitor is doing exceptionally well for other folks on the internet it seems too!
Personally, I've seen A LOT of different Dell IPS monitors in person thanks to local Tiger Direct and Micro Center stores... and I hate the look they have. I think a lot of it comes from the anti-glare sort of cover on the screen, but I think it looks washed out. The MX239H is not only cheaper than most of Dell's offerings, but imo, a better buy for the more important reasons of what it actually does.
Also, it's an AH-IPS panel.