You can't go wrong with any of those. Both Delica and Endura have already proven their use after years and years. The Manix 2 comes in so many different varieties, that I don't speak of thé M2 anymore. They're all blades with the same idea, but a different execution. You've got the allround M2 with 154CM which should be a pretty good allround and/or harder use folder. You've got the translucent blue lightweight Manix 2 (which is amazingly light) with FFG blade which is maybe not as tough as the regular M2, but it gives you another steel option and it's really light. You've got the moonglow with yet another bladesteel, the s90v M2, the CTS-BD30 M2,...
Ofcourse there are other Spydies, but the three -i'll call them 'groups' since the Delica and Endura also come in different executions (zdp, g10, wave opener,...)- of spydies you've mentioned, already offer a lot of diversity.
Gotta cath 'em all