the 2017 tv's have pretty good sound or do i need to cop one?
i haven't bought a new tv in a long time and the older ones had some shytty speakers.
If you have a day job and can afford to put aside £1000-1500 just for a 4KTV then you shouldn't skimp on the audiovisual aspect of the viewing experience either.
Buy a decent mid-range receiver/amplifier with enough output to so you know not to blow out the speakers on the receiver's max volume or under power the speakers so they don't even output the sound to it's full potential and end up ruining your speakers even faster than being blown out.
I'd spend just as much on the sound system as it is a one off luxury item you are buying to treat yourself *ONCE for the foreseeable future (ie next 10+ years)
If I were to point you into the right direction it would be
Klipsch speakers:
+
Combined with any mid-range receiver with enough features that meet your needs like HDMI outs etc. Just make sure the receiver can even supply enough watts to the speakers.
Also, when you buy speakers make sure you are aware of the RMS watts of the speaker as that is the true volume of watts the speaker can handle. The peak watts are usually shown for marketing mumbo jumbo to trick potential first glance buyers. This way you know what you are buying. Rule of thumb, if the manufacturer do not list the RMS watts then don't buy it. They should list both and Klipsch does list both.
I hope I made your hunt easier.
Since the electronic expos are just around the corner and the World Cup is about to start in 2 months I'd suggest to you to hold off until June or July to buy your electronics cheaper due to the mass sales.