LG has a 32″ 4K HDR option. It was cheaper when I got it but now it’s about 395 here – https://www.novatech.co.uk/products/lg-32-inch-32un650p-w-4k-uhd-lcd-monitor/32un650p-w.aek.html
Does what it says on the tin so no complaints from me and comfortably in your budget.
Maxwell