How about this: If I were you, I would have written...
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Grammar GeekHow about this: If I were you, I would have written...Hi Tcl, listen to GG, if you want something that's probably more "common"... another way to say the same thing. However, if you really wanted to say that the way you originally thought of it, you'd have to say...
KooyeenIf you were me, you would......since that's what 99% of the people would say 99% of the time.Hi Kooyeen, Greetings from the proud 1%!
AvangiMaybe GG's choice avoids the issue, since "you" is both subjective and objective.I agree. Formally
Between your two choices, the second is common but only the first is "correct." "Were" is subjunctive form of "to be" so the noun complement?? keeps the same case. "Yo soy yo" - "I am I, Don Quixote!" - Not, "I am me."