" Of course in a conversation someone might say, "Whoa! " This would be perfectly natural. In the example you gave, plenty and more than enough would have about the same effect.
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AvangiThe expression is, "more than enough." If you say, "more than plenty," we'll take it as a play on words - sort of like saying, "more than more than enough."
Of course in a conversation someone might say, "Whoa! That's plenty!" (Perhaps someone is pouring him a strong drink.) Another person might add, "That's more than plenty!" This would be