I would have been interested a few months ago before I picked up a 28" nec.....
For those interested, these monitors are made by Barco, and in theory perfect for genuine arcade video reproduction:
They take RGB in, and are specced to sync up on everything from 15Khz-36Khz (800x600). So they should work on EVERY arcade mode (15Khz/25Khz/31Khz), as well as work as a PC monitor up to 800x600 (SVGA).
I only say in theory as I've not physically tested one myself...