In this link you can find basically all the Omnisphere 2 sets that have been released: Take a look at developers like Pluginguru, Joseph Hollo, Rocky Mountain Sounds, TheUnfinished, Subsonicartz, Pulsesetter etc to get a bit an idea Now with the just released Omnisphere 2.5 update, expanding its options even more it opens up a whole next extra world for us developers and there are many many amazing talented people out there making great expansions that extend it in every direction you want to go. Omnisphere is not something you should consider if you want realistic and deep sampled instruments, but if you want a great personal universe where you can have a lifetime of inspiration filled with everything going from ambient pads, till analog growling till experimental madness then this is the one. Depends a bit on how you want to use the choirs? Do you want some etereal background choirs or more realistic or something else?
