I just use the two Apple Studio Display LCDs that I was given with the G3 - I have one hooked up to the G3 and the other for using with any other Macs. I know they don't really go with the 68ks as they're what I see as one of the first pieces of "new Apple" (ie colours, translucent etc) hardware, despite still having the rainbow logo, but they are better than the old Apple CRTs that match the 68ks as they look gorgeous (sorry, but the Performa Plus is seriously ugly!), perform better than a lot of them (higher resolution), and of course take up a fraction of the space.

I do have a Macintosh Colour Display (small 640x480 trinitron) that I used with my Macs before I got the LCDs, but am getting rid of it as I only have the space to keep either that or the second LCD. They do match the Mac LC nicely though as the base lines up with its case exactly. Using the LCDs does make you realise how bad the video output on older Macs is though, as I mentioned in the topic about 6100s - I'm actually considering getting rid of the 6100 now as I don't consider 640x480 nor 256 colours to be useable, and is a waste of a decent LCD really. I haven't tried an LC II on there yet, but those probably only do very poor quality resolutions too