Well this are my ideas i hope u like it
on top of orthanc powers:
-the power of curunir (maybe he can cast the spell wherever in the map)
-fireball(only a medium distance)
-wormtongue (around orthanc)
-palantir vision (all the map)
-mmmm leadership XD
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saruman at the floor:
-wizardblast
-fireball
-wormtongue
-leadership
-alternative palantir(like gandalf's)---> -lighting bolt (normal)
-speechcraft(i know wormtongue has it but like the description says: the power of saruman is in his words)
-Saruman the ring-maker (maybe he can increase the damage of his magic 25% for a small/medium duration)
:and now the powers that the one ring gives to him:
-The slave of the ring (like in the game, Saruman turns black and serves the will of the ring, that is the will of Sauron)
-Saruman of the White colours (Saruman releases all his migthy; like the book say: ...and sauron was afraid of Saruman,because he knew that if he got the ring, Saruman will become much more powerful than Sauron himself...)
--mmm I've already watched Saruman of manycolor's video & it's wonderful
well i hope u like it...byebye