Kevin Goldstein of Baseball Prospectus listed the top 11 Yankees prospects. That list is below, along with their star ratings:
Five-Star Prospects
1. Jesus Montero, C
Four-Star Prospects
2. Arodys Vizcaino, RHP
Three-Star Prospects
3. Manny Banuelos, LHP
4. Zach McAllister, RHP
5. Austin Romine, C
6. Gary Sanchez, C
7. Slade Heathcott, CF
8. Kelvin De Leon, RF
9. J.R. (John) Murphy, C
10. Mark Melancon, RHP
11. D.J. Mitchell, RHP
He also lists infielder Corban Joseph, SS Eduardo Nunez, right fielder Melky Mesa, and left-hand pitcher Jeremy Bleich as "four more" prospects to look at. If you're a BP member you can view their scouting reports on all the Yankees on the list
here.