If it comes down to two of Hags, MZA or MSL, I would keep Hags and MZA, if for no other reason than Hags and MZA are both much, much younger. We might get another 2 years out of MSL, they may even be very good years, but the other players will provide a longer term benefit.
If that isn't the way the Rangers go, then the most sensible plan would be to trade Hags and sign the other 2. Hags will be RFA, so he can easily be traded at the draft or in the summer, and he should garner a decent return. I like Hags and think we will miss his speed and PK ability, but from an asset management standpoint, trading him would make sense.