From what I've seen, the AppleVision 720 is a fairly solid display, definitely one of the cheaper ones, but not a bad display by any means, good for general use, or for hooking up to an older 68k Mac that doesn't need to go to resolutions too much higher than 1024x768 (a resolution I'm comfortable with on the ones at school.)

If you've got the room, I'd keep that 720 around, just because it can be used with a variety of Mac hardware, from the newer 68ks that support multiple-scan monitors, to the later PPCs. (and probably PCs and the newest Macs, if you've got an adapter to use it on a VGA port.)