In terms of pure star power, I think Round 5 is shaping up to be the biggest round yet.
Five inner-circle Hall of Famers--Musial, Mize, Mays, McCovey, and Perry--plus two more MVPs (Cooper and Shantz) with three picks still to go, and the 1959 Yankees--a roster with 4 more Hall of Famers on it--queued up for the next pick.