I'm actually interested in recommendations owhich music from this genre+era people think has held up well!
Some positive recommendations:
Early Ozric Tentacles (Pungent Effulgent, Erpland, Jurassic Shift)
Bruford Levin Upper Extremities (w/David Torn & Chris Botti)
The King Crimson "ProjeKcts" (esp the ProjeKct Two studio album Space Groove, and the live recording of ProjeKct One)
Also, I wouldn't call it good, it's far too ridiculous, but I find that I enjoy the first Liquid Tension Experiment album. A recording that's definitely unencumbered by excessive worries about "would this be in good taste?"