The third has the best style. The two sentences are parallel in structure: thought (past, one time event, completed).... would (future to the past event) The past perfect in # 1 and #2 is OK, but it is crying out (to me) for another past time reference.
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AlpheccaStarsThe past perfect in # 1 and #2 is OK, but it is crying out (to me) for another past time reference.