The Compaxes fall into two broad categories - the pre 1960 ones with in house calibers and the post 1960s with Valjoux 72s. BOth are perfectly respectable chronograph calibers. The various UG/Martel machines are essentially scaled versions of the same movement - very little practical difference among them, so asking for a Compax with a great movement is essentially the same as asking for a Compax. And there you are dealing with hundreds of references, so I'd suggest following the models a bit on the forum and elsewhere on the web to allow you to narrow it down a bit.
As for the calendar watches, they've all got the same caliber - you can chose with or without moonphase.
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