aq_mishu:
Again saying, RAM and etc is just as an analogy.
This just reinforces my suspicion that if you write down exactly what you really want to do (no analogies, and no brigadiers) you will find that it is very much simpler than what is currently in your head.
But for pricing issues, i have selected arduino and also for stability.
Unless you plan to make these things in commercial quantities the value of the extra time taken to implement it on an Arduino (or, especially on multiple Arduinos) will far out weigh any small saving in hardware cost.
The biggest risk to stability will be your program, whatever platform you use.
...R