Here's one:
Bullis and Landon will both be Top 10 national caliber teams. One of them will probably be Top 5.
Gonzaga and Prep will both be Top 20 national caliber teams.
SSSA and Paul VI could sneak into the Top 25 as well, but both have some work to do to prove it.
I think by the end of the season, only one team from the IAC will be in the top 10 National polls. A lot of this depends on how either Landon or Bullis perform in their non conference games.
Prep was BAD last year. They didn't even finish in the top half of the league. Several of their early commits were 8th grade middle school super star who committed in 9th grade when college coaches were taking gambles on kids. They will have to win some games in their own league to be considered top 25 IMO
SS/SA will be good and I project them to finish in the top half of the IAC with Landon and Bullis.
PVI is a wild card. They always look good on paper every year but they are poorly coached and only win games in the summer and during Fall Ball.
Gonzaga will be similar to what they were last year but should win the WCAC.