Investment? Depends on how you define that. I'll assume you mean for tone and playability?
My personal preferences say, yes. I've tried some Dean's and was not very impressed. With most Fender's you kind of know what you're in for. Barring the lemons that get through what ever abysmal QA system they have in place.
I would say give some of the new Squier basses a shot as well as the Fender's and see if you can discern a couple hundred dollars in difference.
Really what this is going to come down to though is to go out and try some out and see what feels and sounds right to you for your style and music. Might even find that your Dean suits you just fine. Sometimes we just get a bug in our butts to change up our tone.