Nets are a bit worrisome. Excellent rebounding team plus a bonafide top 10 player in Deron and the second best center in the league with Lopez. Put those three things together - a couple nice bench pieces with Brooks, Watson and Evans...that is scary in a 7 game series and this is before Johnson and Wallace find their strides.
Knicks - less so, but those guys are big down low defensively. Another excellent rebounding team - great rebounders in Melo, Kidd, Chandler, Sheed and Camby. And Carmelo is definitely moving the ball better than he ever has in his career. Injuries are, of course, a huge concern for this team but Felton is a very competent point guard.