Let me temporarily re-phrase the question to include guitars in general.
I thought I had achieved that holy grail 30 something years ago right after I bought my rosewood Gibson J200, to go along with my Gibson Les Paul cherry sunburst with hand-wound pick-ups. Fast forward to the present, where I now own too many (no way?) acoustic guitars, including a few Taylors. Unfortunately I have also lately acquired a bit of arthritis, so my current workhorse is my new-to-me 412e-R rosewood Grand Concert with the shorter scale.
Let me answer an unasked question. If I had to have only one, it would be that Taylor 412e-R. No, there's nothing special about the looks, but I can play it pain-free all day. And I love the sound, otherwise I wouldn't have bought it. I really enjoy the different sounds my other guitars bring, especially my 818e, which is the best sounding instrument I have heard. But I have to adapt.
So back to the original question, my holy grail would be a rosewood/spruce (my overall favorite sound), and for all the reasons above, I already own it - the 412e-R.
But my ears are always open, and who knows what I'll hear tomorrow?