For me it was "The Big Melt" in order to protect the endangered species of wallets. (I heard wallets are on the red list now so we should do our best to keep at least a few of them alive)
All in all I melted my Carrack, my Endeavor Master Set, my Hull-E, my BMM with 2yrs insurance, my Retaliator, my Weekend Warrior, my Starfarer, my Mustang Delta and my X'An Scout to buy the Armada pack and the CCU´s for the BMM, Orion, Carrack and Hull-C and all other $0 CCU´s.
My wallet took a hit of about $100 which it fortunately survived.
Only the 890 jump, physical Rear Admiral Phoenix and M50 remained untouched.