It's an unanswerable question...

Samplitude Pro X will cover all this. Its a top end DAW program. No need for three different DAW's if you have Pro X. But you may want to invest in the suite or Sequoia, the big brother to Samplitude Pro X. It has a few more mastering goodies.

The answer as John put so eloquently, It's an unanswerable question... Or to put it another way, can you do it to your satisfaction?

I heard Sony cd archiect is good for post production too, I am not sure my friend told me about it. Anyone used it or know of it?

It's a capable PQ editor -- If that's what you're looking for. I wouldn't exactly call it a post-production tool (although the assembly and PQ editing of a project is certainly part of post-production... The very last part for that matter).

I always related Post Production to Audio/Video. I never thought of it in strictly music terms since it's all production until the master.