I think Gandalf was sent back to Middle Earth because he still had a part to play. When Saruman died that was pretty much it, it was over - also why would the Valar want to send him back to wreak more havoc? As for Sauron I don't think he really died he was still just floating about waiting to come back and cause some trouble. I guess he only had enough power at the beginning to become an eye...then couldn't get back to his full strength without the ring.
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'It must often be so, Sam, when things are in danger: someone has to give them up, lose them, so that others may keep them' ~Frodo
"Life is hard. After all, it kills you." - Katharine Hepburn
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