I can't recommend a TV for you but the 4K TVs seem to be dropping in price. Lots of good reviews on them but if you're a gamer and want to game at 4K, only a couple of TV brands will do 4k @ 6oHz 4.4.4. Namely most of the LGs and some of the Samsungs. Most will do 4K at 30Hz which I hear is fine for movies. Another problem is you need a GTX 980 or GTX 970 video card with the HDMI 2 ports to achieve 4K @ 60 Hz 4.4.4. Lesser cards such as the GTX 700 series will only do 4K@ 60hz 4.2.0 or 4.4.4 30hz. These TVs are being given good grades for upconverting 1080p or 720p to 4K even though there isn't much 4K source material yet. Netflix has some if you subscribe to that.
Anyways sorry for taking this a little of topic, but I've been looking into them lately and just ordered a 40" Samsung HU7000FXC which is going for $800, for my computer room. It's not guaranteed to do 4K @ 60hz 4.4.4 but I most likely won't be gaming with it anyways.
here's a link showing some threads on the GTX 9xx cards situation with 4K TVs.
https://forums.geforce.com/default/board/155/