I have been looking at 24in models, here's my experience so far:
Acer has a nice one that's got hdmi inputs, 2ms response time, and a 3000:1 contrast ratio. I compared it to a Gateway 24in with similar stats and an HP w2408. Of the 3, the HP has a glossy screen and the "worst" stats for response time at 5ms.
I generally dislike all things HP (don't ask why) but I was really impressed by that monitor. Of the 3, it was a standout even though the stats were better on the acer. Color saturation was good on the HP, probably from the glossy screen, and although the contrast ratio is average at 1000:1, the "blacks were blacker" than on the others. It also has a cool feature of being able to rotate 90 degrees to portrait, but I'm not sure how this would work on a mac (anyone with experience??).