Check
this list for gaming oriented TV sets. Unfortunately, that list is only for 2015, and from what I've heard, there haven't been any phenomenal gaming TVs this year. In 2013 and 2014, Sony was the input lag king. In 2014, Samsung was the input lag king in 4k TVs, but not sure how they generally fare in 1080p sets.
Anyway, the list is sorted by default for the gaming rating. After that, I would prioritize the combination of input lag and response time as the primary deciding factor.
Among 2015 alternatives, the Samsung JU6400-serie seems like the best bet (though apparently pales in comparison to Sony's 2013-2014 models). The U in the Samsung's model numbers indicates Ultra HD (=4k). The JU6400-serie starts around £500. If you want to gamble, then you could try the regular J6400-serie, which is 1080p and slightly cheaper. But no guarantees that it behaves like the JU series, even though the rest of the numbers are the same.
Check
this thread for more detailed Samsung 2015 info.
And
this for more detailed Sony 2015 info.
Personally, as it seems that the Sony's 2015 W7C line is supposed to be a successor to the 2014 W7B line, I would probably go for the Sony KDL43W755CBU or KDL43W756CSU (they are basically the same, the other is black, other silver), and wish for the best. I have only found
DigitalVersus review of the W755, and they note that the input lag (36ms) is higher than 2014 sets on average. Unfortunately, the DV has (IIRC) been known to have less-than-accurate input lag readings before, so we can't make direct comparisons to the Rtings-list. There is also the KDL40W705CBU, which is cheaper (around £380), but drops the Processing rate all the way from 800Hz to 200Hz. No reviews of that, though. It might be more direct successor to the fabled KDL42W705B, which I mentioned earlier.
Actually, now that I thought about it further, I might indeed go for the KDL40W705CBU, instead. The lower processing rate makes it slightly inferior in regular broadcasts, but for gaming, it doesn't matter.
Ps. Remember, anything above £15 for an HDMI cable is a rip-off. For 2 meters cable, I wouldn't pay more than £5. Also, I have both DVI-HDMI and HDMI-HDMI cables. There is no noticeable difference between them with 1080p. Furthermore, the signal going inside the HDMI cables is digital, so the "quality" of the cable doesn't affect input lag or image quality or any other similar factor. It either works, or it doesn't. There is no middle ground, like there is with analog signals.