The answer is always damage. But, I understand its not your first priority.
You want CC with Chill and survivability for you and your party, right? If you want Chill, Chilling Nova looks like a no brainer. As you cleave, it will keep everything around you sufficiently chilled almost by itself. But youll need to crit and keep aggro. Just eyeballing the build, you would get more damage out of crits than condition damage. Knights gear is good for that. Here is where the Blood line comes in. Now that you can crit and your crits do AoE damage and Chill. You need to hit often. GS and Staff are slow. Dagger/Focus should be considered, especially since your not going SR to maintain Reaper. This can be supplemented with damage wells. Take Vampiric traits and wells that will protect and heal you and your team, as well as a small party wide DPS boost. You'll gain health so fast it wont matter how much health you have. Toughness+Protection(-33%)+Cold Shoulder(-15%), will be plenty of damage mitigation. This is my theory craft on how it would look. Good luck and happy hunting.