Alternatives to colossi in PvP

  (Edited: )

I've just watched Daily 469, and playing protoss myself it got me thinking about trying to get around having to always build a good amount of colossi. Obviously colossi are so good it'd be hard if not impossible to avoid building them forever. However lot of players get around 5 or more colossi before getting anything else of T3 in the mix. So I'm wondering how feasible it'd be to get large numbers or phoenixes and immortals (maybe even archons) instead of the colossus tech and the colossi themselves, at least until the point when the full late game composition starts appearing.

Edit: Apologies for the stream of consciousness style post I'm still thinking this through myself