Apart from the "big bang," I am unfamiliar with those cosmogonies, but will be interested to hear what you find.

One other general conclusion about Neoplatonism: the waters get pretty deep pretty quick with this material, and different writers seem to introduce divergent ideas. For some, intensive, deep contemplation of the various hypostases leads to valuable insights; for others (like myself), a more superficial understanding of the major concepts will suffice, especially when it comes to its relevance/explanatory power with regard to your praxis. This is why I like Sallustius: he's effective at outlining the major ideas without (IMO) compromising them, and offers the option of wading out deeper, should one wish to do so.