My personal favorite for 68k Macs has long been the AudioVision display -- decent ergonomics, great inbuilt speakers, really sharp picture, and of course, an ADB hub. Just about the only thing it doesn't bring up to your desk from the back of your Mac is a serial port.
After that I had an Apple Multiple Scan 1705 for awhile, great solid display, and it would've worked with a VGA computer too, but I had to leave it behind last time my family moved.
Beyond that, I love Dell UltraSharps, and want a 1708, 1800 or 15xx series, and I also would love one of the original 15-inch Studio Display LCDs.