Floors 6 (dressy formal wear, suits, shoes, jewerly) and Floor 7 (younger, contemporary) are a paradise for the male metrosexual. Go when they have a sale, you can end up with great clothing (I scored a pair of Costune National pants for $130 during the Finale sale).
Extensive selection of Helumt Lang, Theory, Dolce and Gabbana, Hugo Boss, John Varvatos, Micheal Kors. You name it its at Saks. Salespeople can be iffy though - some of the guys on 7 think they are on the runway instead of the selling floor.
Pros: Extensive selection