coming from a gdm-fw900, like I did, you are going to want a ips display as anything else would be a major step down in terms of picture quality unless your crt needs to be tuned due to age.
In the 24" range your best bet is to see if you can get a u2410 used or an Asus pro art if you want to spend more to have a less aggressive filter.
If you want side monitors to match your trinitron you may want to look for slightly smaller e-ips screens as the viewable area of that 24" is actually 22". A good match would be the u2211h or u2311h depending on which is closer physically even though they are 1080p
Its quite possible it does need it, tho it does look pretty dam good. Its developed an issue however. After it warms up, it does sharpen up, however its getting a green haze at the top center area which is bumming me out (the haze isnt there when the monitor is turned on cold)
Id reeally love to keep this thing, but its a freaking bolder to move and takes up a TON of desktop space. Plus im sure its not very friendly to my energy bill. Its just very hard to find a comparable flat panel display.
I would be happy with a 22" honestly, its just Soo hard to find a 16:10 22" display these days. This FW900 also has crazy high refresh rate, which i haven't been able to take advantage of (if i switch to it, the image quality seems to drop, not sure why)
It will be a while (proly a year or so) before i start dropping the money for more displays, but i like to get a head start on my research because im super picky and like to know what im getting.
I saw in another thread, the mention of the u2410, and while it looks pretty good, the price is pretty crazy. The u2311h wouldnt be bad i guess if i replaced the 900, but i couldnt use them in conjunction with it, as the aspect ratios would be out of whack. (16:9 does NOT look good on this monitor)
