Provided the specs are right for you personally (e.g. in my case storage).
Back to the OP, I don't think text/calendar/todo are an issue, as there are many apps for these, so you don't have to use what comes with the phone. Camera, screen, battery and (if you don't intend to root) software+updates are more determined by the handset choice, and build quality of course. We probably know most about the One X+ at this point as it has a lot in common with the One X, but we'll know about the others soon.