RE: 2.4ghz module dilema
It´s a VERY trustable radio! Don´t hesitate in using it.
The 8103 is a wonderfull machien, and will do all what you want. The Spektrum module it´s a very tested device, and you´ll have no problem at all.
Don´t let the new plastic shiny radios comming make you think that the trusty 8103 is obsolete. Nothing is more untrue.
Keep enyoing that thing.