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I want to say big deal/grand finale, but more professionally.

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closed as not constructive by Kris, Jasper Loy, Daniel, Mitch, Manoochehr May 6 '12 at 6:50

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

This question doesn't make sense to me. Big deal is probably always slangy and/or facetious, but surely grand finale is formal and "sophisticated". I can't say it's more "professional" without knowing at least something about the context, and what exactly OP wants his expression to refer to. – FumbleFingers Apr 28 '12 at 2:23
Sophisticated, big deal and grand finale are not quite the same or in a class. Not real Q. Voting to close. – Kris Apr 28 '12 at 3:44
How about fanfare? Or overture? I realise these are more about the beginnings of things, rather than the ends, but they may convey the grandiosity you are after. – Brad Apr 28 '12 at 9:51

The question is not entirely clear, but perhaps you are thinking of terms like last hurrah ("A final act (by a politician etc.) or performance (by an actor etc.) that marks the end of a career") and swan song ("A final performance or accomplishment, especially one before retirement").

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Depending on the context, you might consider pièce de résistance. Wikipedia says this phrase "gives the sense that the referred-to element is the most outstanding, notable, or defining of the collection." Though literally French, the term is used in English. From Wordnik:

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