Votto has the best career batting average of any Reds player that anyone on this board has ever seen. He's first all-time on the team OB list and second all-time on the team SLG list. He is, in short, the most dangerous player at the plate in franchise history.
If what you want is a guy who hits 40 HR every year like clockwork, then the Reds need to get that guy and add him to Votto. Though the last guy the team had with that kind of power caused no shortage of arguments.