I don't think "cherryco" has more than 20 Lacy LPs (have to look when I get home, he he) but yeah, the aforementioned "Sortie," "NY Capers and Quirks" and "School Days are a few of my favorites. I don't really like Irene Aebi's vocals, and I think I ended up parting with a number of Aebi-Lacy sides, but the small group trio/quartet/sextet stuff from the late 60s-early 70s I find most interesting (as he was still developing his thing). But I do like the trio of Lacy-Betsch-Avenel too; I was lukewarm until seeing them live -- a great working band if there ever was one.
Lacy and Waldron made a great pair: the recent 4CD set on HatHut of their two duo LPs is astounding. The Lacy group plus Waldron also made a bitchin' side for America records in France, and a slightly pared down aggregation turned out "Journey without End" on Japanese Victor -- both of these are excellent.
Finally, his solo LP on Saravah, "Lapis," is a classically warped side of Lacy let loose with the tape machines in a Paris studio. Fun stuff.
He's a really individual voice, who's still "finding a way to the other side" in the music. Long may he live and create.
C