The OP was not looking for an opinion piece on the evils of watching television.

$6000.00 is the mental limit. 60"+ preferably.

Very limited current use for a 4k TV as only a few (internet) shows broadcast in higher resolution. If you purchase a 4k TV you are planning for the future...I'm unsure how far into the future, but maybe others know. As far as smart TV goes, there is a lot of programming accessible on the internet that makes it worth not having cable/satellite TV. Most are subscription, however. If you deem that smart TV is in your near future, even though I have purchased a few and have had no problem with them, I would not purchase a Vizio TV as they dictate to you what streaming programming is available to you. I purchased a smart Samsung TV for my daughter this past Christmas and it works great for her.

Has to do with wanting to hear your own voice...or text?

Although current 4k content is limited, I have seen upscaled content look quite impressive, especially blu-ray content. You don't necessarily need 4k content to see the difference in a 4k tv. The processing and technology is newer.

However someone did make a post earlier about how once in the home they all look great. That's pretty accurate. Even a mediocre 1080p tv is going to look great when you play a blu-ray or some solid HD content.

Sony or LG for picture quality & reliability. 4K sure, OLED if it's in your budget. Smart TVs can compromise privacy depending on set up you don't have to use the smart features so think about what is important to you convenience or privacy. I use laptop with Hulu & Netflix no cable.
A decent sound bar like Sonos or Paradigm brings sound quality to nice levels. Get an extended warranty as electronics are not living as long as we think they should. Sony & LG are more reliable than most Your mileage may vary.

The new 4K tv's upscale broadcasts to higher resolution. I purchased a Vizio 65 inch 4k tv about 2 months ago and am very happy with it. There are more than 30 choices of streaming programming available on the set...more if you plug in an external BD player or Roku

I also had a Samsung dlp that we retired last year. I bought a Samsung 65" smart tv and am amazed at how much better the picture quality is and I love the Internet ready feature that allows us to watch Amazon prime, Netflix, etc. we don't watch that much, so I figure the tv watches us more than we watch it.

If you purchase a smart television and need to purchase a Roku or other internet device to see some internet streaming channels you prefer, you have defeated the reason for purchasing a smart TV. You may as well save your money by purchasing a dumb TV and a Roku, as well...

Buy 4 of these! Samsung 60" 4k for $1480, free shipping:

Samsung 60" Class (60" Diag.) 4K Ultra HD Smart LED LCD TV UN60JS700DFXZA

I just bought a Samsung 65" 4k HD at Costco. They were having some kind of manufacturer promotion so it was $600 off. Regularly around $2k, bought for $1400.

The picture quality is superb and extremely noticeable on newer movies. I initially thought 65" would be too big for my family room but I was instantly used to it.

Sound quality is not very good and running through a surround system or stereo is a must for movies.

Internet access is terrific. I did not have this before and I can tell you that YouTube videos of Porsche's will never again be watched on my pueny laptop; big screen is the way to go. Net flicks is also great and something new to me.

For me, this opened a can of worms.....I also bought a new AV receivers and speakers. This weekend I'm painting :(

Good advice here, thanks guys. I think I will go with THIS

That is the same tv I just bought. it's a very nice tv.

If you haven't picked it up yet, you should hold off on that one and look for a 240 Motion Rate 4K Samsung. Right now, you're looking at a 60 Hz model.

"SAMSUNG: For 4k TVs, the Motion Rate number is twice the real refresh rate. A UHD TV with a Motion Rate of 120 has a 60 hz panel."
(From this chart explaining how the different brands designate their refresh rate: Fake Refresh Rate Conversion: Samsung Clear Motion Rate vs Sony MotionFlow vs LG Motion Clarity Index)

I wouldn't let someone give me a Samsung for free.

Understanding the difference between 60hz, 120hz and 240hz

Check out the comments.

Your Samsung TV is eavesdropping on your private conversations - Feb. 9, 2015