It doesn't sound like anyone has really broken this car yet except for the epic crashes. At this point Id say the list of spares would contain the normal items that most cars require.

I'd get:
a spare plastic spur gear (personal experience),
rod ends for the upper arm links,
lower arms all around,
set of hinge pins,
rear hubs,
front knuckles and caster blocks,
some sort of CVD repair kit (a bone and the barrel and pins),
shock ends
shock shafts,
the steel bushings for the front steering setup (all it takes if for a screw to fall out and you loose the bushing and your day is done).


Anyway, that would be my short list.


Its really impressive that there has been next to no breakage reported on this car at all.