+1, I think pathfinding is something that is really necessary for projects that are striving to be entirely driven by playmaker actions. RAIN seems to be a good solution, it's even free. It would be really nice to get official actions for any of the 3rd party pathfinding solutions since they are all basically fairly priced and some free.
The NavMesh solution is Pro-Only so that definitely limits a portion of the user base and it could potentially provide a huge range a functionality for more dynamic gameplay, so many different things can use pathfinding other than unit AI.