Best monitor

Hey all, I’ve had a 1440p monitor for a while now and it’s been fine but I’m in the mood for 4k and to upgrade because I know what I have is about 5 years old and is a bit outdated. The only thing is when I’m not playing games I like to watch a movie or show on my Xbox as well and I was wondering what’s my best option for a 4k monitor that also has speakers. Thanks for any help. Also I’m hoping for 500/600 and below not trying to spend a 1000 dollars on it.