"Holy Trinity" of Lenses - advice needed

That's exactly what I do - the 12 is on a lot of the time, but the 25 and 45 cover most of my other options, and I'd rather have the optical performance that they deliver than the ability to not have to swap lenses.

The only others that I regularly carry are two legacy lenses - a Tamron 90 SP macro, and a 135 2.8 nikkor - both superb pieces of glass in their own right, and providing capability in closeup and reasonably long tele respectively.