I read all this and thought I'd throw in my 2 cents.

IMHO, you were right on track on 7/31. The SuperStar is a great plane, which you already have. The OS engine is great and can be reused for a future plane. And I would recommend going with a basic 4 channel with BB servos for the following reasons:

1) They only cost about $10 more than the flight pack alone, and that flight pack can be reused with your future computer radio.
2) The 6DA will likely get replaced by a computer radio in the near future and its features are not needed for a trainer, so that would be money down the drain.
3) You probably don't know where this hobby will take you, so you don't know which computer radio to buy at this point.

: )