Looking for a special task management software

[horacioemilio]

Hi,

I am looking for a software or web solution for organising my tasks list. I
need for this to have the following things:
- I can define a list of taks, and subtasks for each of them (it can be done
by a lot of programs)
- When I am planning every day's work I can say for instance that I want to do
three of four tasks/subtasks and schedule them, for instance, the first one
must be done between 09:00 and 12:00 hours, the second one between 13:00 and
15:00 hours and the third one between 15:30 and 17:00 hours (it can be also
done by a lot of programs)
- If I delay the first taks and finish it at 13:00 hours instead of 12:00
hours as planned before, I want that all the rest of taks of the day will be
shifted acoording to this delay, in this case, one hour (it can be done for
some program but not very easily)
- Each time I finish some subtask, the whole progress of the respective task
is updated according to some rules defined by me (some very complicated
management programs include this feature, but only this and not the rest of
the previous things)
- I can also specify that each week I need to do three times a week of task A
and 2 times of B and so on, and the program reminds me of the rest of times
left
- When I look at my task list, I can order or organise the list according to
different criteria; priority, completed, non-due, deadlines, etc. I can order
tasks and/or subtasks. For instance perhaps i am only interested of
organising sub-tasks. (I don't know a program that can do this, they usually
order taks but no sub-tasks)
- It is possible to implement the ideas of "Getting things done" from David
Allen (there are some programs for this, but lack the previous features)

Do you have experience with some software that has all this characteristics or
some of them ? Or some suggestions to work in this way ?

Thanks