Looking for a 40-43" 4K TV


Just looking to buy a cheap 4K-UHD tv.
I have two things in mind that i need to clarify though
1- I dont know if it should be also a smart tv or a google chromecast would be better?
2- Is HDR feature so important? Does it really make a difference?

What brands would you recommend? Plus, should i wait for the end of this month for better EOFY deals?

My max budget is around 500 dollars.

thanks in advance.