Thanks all for the info onthe CO8 mods — however, after visiting the links I am a tad cornfuzzled on which version to DL.
At
http://www.sorcerers.net/Games/ToEE/index_circle.php 5.5 seems to be the best choice (following Skaven's advice to use the beta.) However, I also found
http://www.moddb.com/mods/circle-of-eight-modpack which lists 5.92 betas (suggesting there must be a 5.8 non-beta somewhere??)
Both, btw, require you to add all the Atari patches first — which I believe are already included in the GoG release.
Would someone smarter about this than me (which would be just about anyone with an IQ greater than an Artichoke) advise whether any of the mods beyond 5.5 should be used?
(For now I have DLed 5.5 and plan to follow Skaven's advice)