Never looked into 1440p monitors, but you won't be benefitting from the Free-sync if you have a Nvidia card though, so that can be out of the question.
But I have heard that freesync is practicly free and shouldn't bump up any costs of a monitor, I don't think this is what happens in practice though. But if you are thinking of ever going AMD it will be nice if you buy one, if not, don't even bother picking one up.