I'd say you could buy one without HDR support, Though most cameras can already do HDR. The thing with HDR is that the industry is still trying to catch up a bit I'm finding. If you edit in Premiere, you can't really even grade for HDR unless you export it to Resolve (Premiere viewports only support up to 120IRE and apparently doesn't add the HDR Flag in the metadata), then there's the fact that barely anyone has HDR monitors to grade with. On top of that, there's a lot of youtube tutorials of people who think they are doing HDR and teaching how to do it when in reality they have no idea of what they are talking about.
Camera body's come and go, and if you're going to buy a new camera within three years, you don't really need HDR. If you're going to keep the camera body for a long time, then it'll be worth it, But SDR won't be phased out for a long long time. Master SDR Rec 709, and then you'll have a much better-starting ground for HDR when it becomes more standardized.