[minke]

Order in which to upgrade ( my opinion)

Fully ballraced
ceramic balls and thrust bearings for the diff
shocks - xpro,B4, xxxcr, or big bores if you have the budget, just dont skimp on cheapo ones
Steel screw kit
Motor mount
Aluminium rear wishbone mounts
Aluminium servo mounts (if you add a powerful servo)
Adjustable turnbuckles

I've not found that any of the other aluminium upgrades arent really necessary, but certainly wont hurt. The plastic parts break that infrequently, to me at least it dont justify the cost.

get a spare kit for parts.

some lead or r/c weights will help with balance, mine used to lean on jumps till I balanced it out and still tinker with weight under the servo depending on the track.