I spent 2x as much money on mine as I should have out of being impatient and not knowing any better. Either take you time and do some research, or look at used one's that are complete, they cost way less, and even if they have some problem's you will still be money ahead. I have a torsion clod and after watching other's, honestly I think it's the only thing I would ever own (clod). I used to have a nice chassis and my crawler was probably worth 6 or 7 hundred dollar's, now that it's torsion it's worth half that. definitely not possible to get out without losing you're ass.
As far as selling you're nitro... I don't know, I just discovered nitro recently and havent touched my crawler other than a few times couch crawling. I am digging my nitro because I can go to the local track and race with people at any given time, where as the crawler I am lucky to hook up with someone once per 1 or 2 week's.