So i am thinking about buying a new TV, and i am worried about the input lag. we got a new smart tv for the living room (i dont game on it), and it just has this noticable input lag. 

so how can i figure out which tv sets to get?

Well if your planning on getting the Neo, 4K TV's are getting cheaper. Saw a 55" 4K tv at my local mall for just 749.00. I know that's what I'm getting.

http://ca.rtings.com/tv/tests/inputs/input-lag

Here's another site with full reviews as well. They also measure motion blur and response time.

http://ca.rtings.com/tv/tests/motion/motion-blur-and-response-time

Question for OP, how do you know your new smart tv has noticeable input lag if you don't play games on it?
I'm asking this since I get the impression you do not have very much experience in this input lag game. You could have tried playing games on your new set but did you do every trick to minimize input lag? It's a complex game depending on manufacturer and model. It's not always guaranteed when you enable Game Mode that input lag really is the lowest it can be on that specific model. Really the best thing you could do is start doing research on your own. Sites such as displaylag are good but only when you have a solid foundation on these things. Most people are totally unaware how shady the TV business is.

You have to know how to set up your TV to minimize input lag as WC4Life says.

Input lag is why I play all my retro (PS2 era and back) games on a big CRT. Almost no input lag! Why, when new tech comes out, we all have to give up things to get things is beyond me.

i played sometimes on it. 99% of the times i dont. i play on my old Sony LCD or my LG 21" LED monitor. 

I got a new tv a year ago, and simply did online research, starting with google. I complied a list of tv's with the best input lag ( a top priority ) ,other features, cost....was able to get the tv that was ranked #2 on the list I made.

Got wicked lag on my TV, got used to it tho

Sony tvs have low input lag. And the new vizios.