As your Black Templar ally, I vote for Cadia. We have fought beside you in Agrapinaa for 2 weeks and we are maintaining one of our Grand Crusades there to keep the heretics at bay. Our other 3 Grand Crusades are now defending Cadia along with my personal forces, the 14th Crusade. We could really use your assistance there. You are right, Cadia is a must keep Sector/System/Planet. If Chaos wins there then they will have won the campaign regardless of what happens in the other Sectors. Your forces have been very valuable in Agrapinaa, but many other Imperial forces have been fighting alongside you there. I have personally posted 5 victories on Ulthor in the Agrapinaa Sector. At least 15 other BT Marshals that I know of have posted victories in the Agrapinaa Sector also.
No one Chapter or Army can clain credit for any Sector's results. We must all work together to defeat the Emperor's enemies. United we shall be victorius, divided we shall fall. Glory to the Emperor, Sanguinius, and Rogal Dorn, and death to our enemies!

Grand High Marshal Hans Ubrecht
Commanding
The United Crusades of the
Black Templars
"It is not our responsibilty to cleanse the Imperium of heretics, it is our privilege! Nay, our RIGHT!" - High Marshal Hellbrecht