You should look into the Sony XD83s -- they can be had for pretty cheaply and provide a pretty good HDR experience; there's even a thread on it somewhere in Gaming. If you're in the U.S., it's likely Black Friday will bring sales for it, too. You might have to do some research, but I hear the Chinese manufacturers like Hisense are also making pretty decent HDR/4K sets for those on a budget, and those are even more likely to be discounted for BF.
Just at this point, even if you're on a budget, there is no use going 1080p as it's quickly becoming overshadowed by 4K. If you can't afford it right this second, I'd say save up and wait for next year's budget/mid-range models, which will probably include much better HDR implementations as the bar is set higher for the mid-top/top-end sets.