Solubility curve for uranium hexafluoride (in any solvent)
So far I have found that it is soluble in:


Bromine Pentafluoride 
Chlorotrifluoroethylene Liquid Polymer, Dichlorotetrafluoroethane, Perfluorotributylamine, Perfluoroisopropyl ether, 1,2-Dichlorohexafluoropropane, hydrogen fluoride and more.
chloroform,  carbon  tetrachloride  and  fluorocarbon  solvents;
liquid chlorine and bromine; dissolves in nitrobenzene to form a dark red solu-
tion that fumes in air


I think the resource given by Martin (2) is the best. Resource 1 gives a solubility curve, but resource 3 doesn't. However, I think there may be data floating around on compounds mentioned by 3.