I don't think the cures should be combo'd personally because like Blizzara they are meant to be reactionary rather than premeditated and set up, so to speak.

If healing combos do become a thing, though, I would like seeing combos with Cure > Regen and/or Stoneskin, or Vice-versa. With Cure > Regen/Stoneskin, the 2nd spell's potency would be enhanced or its duration increased. If it was setup as Stoneskin/Regen > Cure, when cure landed it could "refresh" the previous spell if it was still active, essentially giving you up to 10 more seconds of regen or a few more hits of Stoneskin.