First of all, I totally agree that we are also having problems narrowing down things we want to see. I'm leary of booking private things, don't want to end up somewhere I can't get out of if they decide to rip us off (ok, so I'm a bit cynical in my old age).
We, too, are planning mixing WDW with cruise. We just have to find out how BFF's vacation days are planned out and schedule around her as well. DH can take off longer if needed, but don't know if she can or not. Maybe we can get together and do part of it together---also want to take BFF to Universal to see Harry Potter's adventure! AWESOME, AWESOME, AWESOME adventure for Potter lovers.