Yea I would recommend hifi speakers if it's just for listening to music in an untreated room as well. They're designed to cope with the crazy random frequency spikes that untreated rooms create by boosting/cutting certain frequencies, monitors aren't.
In my experience, decent monitors will pretty much never sound bad in any room but if it's untreated they won't reproduce the sound faithfully. Neither will hi-fi speakers but they may give you a more enjoyable listening experience and they will be cheaper.