Modern costs more to put it briefly. $400 just doesn't get you much worthwhile IMO (maybe for short term if you want to maybe sell it or use something in another system, etc). You wouldn't particularly need the latest/greatest features otherwise which are aimed at 8k use.
Doesn't really matter if it's for music or movies, more about whether you want multich capabilities and even good subwoofer integration features....much 2ch gear doesn't have ways of handling even digital audio in some cases. Sometimes you just gotta do your homework, hard to give you a list of potential units, there's simply too many. I'd aim mainly at Yamaha, Denon, Marantz for avrs....Onkyo/Pioneer/Integra maybe. Sony hasn't been very competitive for a while and hardly offers anything now.
Having a 4k tv would probably stick to avrs from the last few years if going used. I'm not familiar with the google home stuff, although I employ four Audio Chromecast units in various systems around the house (and went the digital optical input route altho the analog section works fine, too).
ps As mentioned, the used market is up on avrs, prices kinda spiked during the covid/shipping issues era....