Generally the same genus are going to be fine when grouped together, with a few exceptions. I don't think you mentioned any of those "difficult" species here.

Not familiar with Aeonium, but Crassula and Echies are usually fine together too. Anacampseros need less light than most, they usually prefer light shade. Sedums need more light. Kalanchoe, Sedum, and Anacampseros are supposedly summer dormant so that might help you with grouping too. Although I'm not exactly a believer of these dormancy time tables. For example, my Crassula perfoliata varigata and Anacampseros rufescence both grew quite a bit over the summer since I got them, and Anacampseros even flowered last month.

Thanks as always, David. Light shade for the Anacampseros, huh? Guess I'll be moving that little @#$% too. I hadn't looked up its special needs yet.

You aren't going to take a stab at my little green rosette succulent ID in the other posting? It's a pretty little thing, but it must be a stinker. Not a single guess - not even genus. I don't even know where to begin.

Yeah, but they still need sun, otherwise they won't grow as nicely, and flower might have trouble opening up like mine..

Oh I replied to that thread, I guess I forgot to press "submit" again... sorry couldn't help much, though

I don't know that aeoniums are that intolerant of direct sun, especially if you're up in Oregon. We have aeoniums all over outdoors here in the bay area, of all kinds, and they seem to do well. They do like to go dormant in the summer time so my outdoor aeoniums are kind of mangy looking right now, but in general, they definitely did much better outside and in bright areas.