Cheapy,
I didn't want to chime in about the TV decision after the last CAGcast due to you not being interested in the 4K 'gimmick' and I never hear you talk about interest in 3D content, but after I saw your tweet about the Samsung 4K/3D TV you're considering purchasing, I figured I'd toss my recommendation into the ring.
You're making a good decision on 4K and 3D in my opinion. Although the glasses for the Samsung TV are 'Active Shutter Glasses', they look very thin and light. I have a 5 year old Vizio that also uses Active Shutter technology in the glasses but they are very big & bulky (i.e. heavy) compared to Samsungs.
I have been looking at new TVs in the same size range that you are and I really want one that is 4K and 3D but also passive due to the glasses being less expensive and lighter (passive & polarized). Brands with those features would be Sonys and LGs. I would go with Vizio again, but it looks like they dropped 3D altogether. Normally, 1080p 3D TVs that use passive technology cut the resolution in half (half for each eye) and if you are a big cinefile (or pixel whore), you can probably tell the drop in resolution.
Therefore, if you go 4K, then by cutting the resolution in half, you get a full 1080 lines of resolution to each eye. I looked at the 3D glasses for your prospective TV and they look like they have gotten much lighter and smaller, so you may not need to go 'passive' with your 3D. It realy wouldn't matter anyway with that particular model of Samsun since it's active. Even if you went with a TV that wasn't 4K (1080p) you would still get full HD resolution to each eye with Active 3D glasses.
I think you've made a good decisioin, unless you want to consider passive 3D. Hope this helps a little.
~Tone-C
P.S. Why not go all the way and get the curved screen (65" Samsung UN65HU8700FXZA)? All of the IMAX screens are curved for that immersive, wrap-around experience. You could have that at home. Just sit 5 feet from the screen. (just kidding)