I tend to run celestial games. Solars, Abyssals, Lunars, Exigents. But for this game I'm not quite feeling Sidereals. DB's I'm willing to have as well, but I tend to have them start at a higher essence and give them some extra merits to play around with. I don't know Alchemicals well enough honestly, so I can't give a hard answer on them just yet.
I wasn't sure about running mixed games before. But I been running a group of two solars, a lunar, and a abyssal. And the byplay between them has been fucking incredible.
To make a note, I may not be able to start for a month or two. I'm waiting for a pathfinder game to finish up.