One thing you should consider when purchasing a receiver for an hdr tv is whether it will have all of the necessary inputs which a lot of the newer tvs do not have. For example, my Samsung KS8000 only has HDMI and coaxial inputs, so if I want to connect my NES or even my Wii to the television, it has to go through the receiver. The Vizio P-series supports composite input, but not work at 240p, so only newer consoles (Saturn and up) will work on it without a receiver. I know for a fact the NES does not work on the Vizio.
I have an Onkyo TX-NR555. 7.2 Surround (I only use 5.1) and it converts analog inputs to HDMI. It can also upscale to 4k, but I turn that feature off as it can cause input lag. There is no noticeable input lag for the simple analog-HDMI conversion.