I'm also in the market for a new TV & will be buying one around May. I've done a bunch of research over the past few weeks & it appears, as the poster above said, 4K isn't even the future proof thing anymore.
HDR (High Dynamic Range) will supposedly make the picture look much more realistic and lifelike with a wider, better color range. At the same time, as with 4K, we don't have much HDR content yet. Apparently, ultra blu-rays are coming tho with both 4K & HDR support this year.
I use this website: http://www.rtings.com/tv/reviews/by-size/55-inch/best
Based on you wanting a Samsung, (or Sony) are willing to spend up to $1,500, and want it to be more future proof for PS5 / blu-rays...
This TV seems to be the best bet for you - http://www.amazon.com/gp/product/B00U5ZT5LU?tag=rtings-tv-bs10b-20&ie=UTF8
It's in your price range, has low input lag in gaming mode, and is HDR ready 
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