BUZZ-Macy's: jumps after Starboard's Smith mentions it as best new idea
** Macy's shares up more than 4 pct and poised for a retest of record highs after Starboard's Jeff Smith mentions stock as best new idea
** Smith discloses investment in Macy's, sees stock worth $125/share, CNBC reports
** Stock sees one of its best days this year on heavy volumes as big downside gap that opened late June gets filled
** Starboard, an activist hedge fund, has in the past taken stakes in companies like Darden, Staples, Yahoo and RealD and pushed for changes
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