Basic spares i would go for are
front wishbones £5-pair
front bulkhead £2.50
front shock tower £5?
front hubs couple of quid
and front springs- silver and blues, rear silvers
don't buy carbon spares either like the wishbones and stuff, the plastics ones are cheaper and better me thinks, i've never broken a rear wishbone but i've broken every front carbon wishbone i ever had-about 10
and only broken 2 plastic ones, the track side support for this car is fantastic, never seen anyone who hasn't been able to get any help or advise with anything for this car
RB5 shocks are unreliable, the ae threaded shocks are simple but fantastic when built correctly