I'm glad you posted, because I am looking for the same sort of recommendations, and have not found much in an hour of looking on this site. Thanks for the recommendation of 13-56 D'Adario EXP coated strings. I've also seen reports that the Martin MSP7100 or MSP7200 lifespan phosphor bronze is a good match.
I have a 2015 Taylor 814CE (the newly voiced model) and am a fairly new guitar player (about a year). I was perfectly happy with the tone until I bought a Martin HD-35. The mellow, harmonious overtones and long sustain on the HD-35 really impressed me. Now I am trying to see what I can coax out of the smaller 814.
First I tried bone bridge pins, which made quite a noticeable difference in the tone. Both the expense and complexity of this mod were trivial, and it can be undone by just re-installing the original pins. The tone is still Taylor, with more volume, more sustain, and more mids (those ebony pins are a large factor in the scooped mids.) I took it to one of the Taylor factory rep events, and compared it with both the standard 814CE and the new 814CE Deluxe. The Deluxe had the lushest overtones (adirondack spruce), and my 814CE had the second lushest overtones with overall highest volume and strongest midrange, which "cut through the mix" of the noisy room better than the other 2 guitars. The rep remarked that it sounded like a couple sticks of mahogany were used in the bracing. Bone bridge pins for the win!
Now I am trying out different strings. Currently I have D'Addario EJ16 light PB strings in it, and it sounds pretty nice for finger picking. They don't cut though the mix like the Elixirs. While warmer, they are still nice and bright, and sound great.
I might go for the bone saddle too. I have seen a post on this site discussing Bob Colosi vs Taylor factory bone saddles - both are good. It would surely have a large effect on the tone, and I 'd probably have to try out different strings again to find the best match.
Thanks,
John