The ACC already has enough representation in Florida. There is no reason to add UCF and USF. I would not mind adding UConn. I also think that Tulane would be an interesting addition, if for no other reason, fun road trips.
I would live to see a stronger Northeast presence, but there really are not that many attractive teams (I hated the hybrid concept in the Big East and would be disappointed if the ACC adopted basketball only schools). The real problem is that there is not many, if any, attractive options. Current FBS schools in the Northeast not in the ACC:
Maine - None;
New Hampshire - None;
Vermont - None;
Massachusetts - UMass (Indy)
Rhode Island - None;
Connecticut - UConn (Indy);
New York - Army (Indy), SUNY-Buffalo (MAC);
New Jersey - Rutgers (B1G); and
Pennsylvania - Penn State (B1G), Temple (AAC).
I just do not see how Army (or Navy) would really move the needle athletically for the ACC. Out of Buffalo, Temple, or UConn, UConn really is the only school of the three that has some national brand recognition, albeit for basketball.
Adding Cincy and BYU make sense for XII. I am less sold on adding another Texas school in Houston or UCF. But even those schools might make sense. Its discussions with UConn and Gonzaga and whoever looks desperate.