It's interesting I've been wondering to Formendacil....
Well Saruman was selected by Aule, and so he does become greedy for power, just like a lot of people from Aule (dwarves for money, and Noldor for their own works). I doubt Aule wanted Saruman to go to Middle-earth and cause heck and destruction, but could be a long the lines of greed...possibly.
As already discussed Radagast, maybe Yavanna just simply told him to take care of nature for her...
I don't know anything about Alatar and Pallando besides they went into the east, so someone can inform us there.
In Gandalf's case, he didn't want to go to Middle-earth he wanted to stay in Valinor, and he really wasn't selected by a valar but Manwe forced him to go, and was said to be most like Manwe. I think that's why we can see Gandalf is the only one to stay true to his task. For the reasons listed above. He wasn't in the same situation as the other istari, therefor he might not have had a "personal task," just the big one.
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