Hi there! I had the same issues a few months ago and I bought the Titan XP.
First and foremost the Titan you described (12G-P4-1999-KR) is last years Titan! The Titan from EVGA is not the Titan X(pascal). Just to let you know, in case you were not aware.
Titan X(P) are only sold through Nvidia's web site last time I checked. Here is a nvida's web store link: NVIDIA Titan XP
Now I did pick up the Titan for different reasons. I got and ultra wide monitor and at 1440p, I needed a decent video ram buffer, to...and I hate this word..."future proof" myself. The Titan XP from what I saw on benchmarks was decently faster than the classified. If I was you, I would buy the Titan (from the website I provided above), and if you don't like it you can always sell it and easily buy the 1080 classified.
Good Luck with your choice...