I would have a few sets of :
Ejector and spring
Extractor and spring and plunger
And one each of the following :
firing pin
bullet guide ( hump wears out )
follower arm ( can bend ) and pin ( can loose )
follower and slide assmly ( cheep and can cause timing problems , but 2nd least important on my list )
op rod catch and accelerator ( timing / clip ejection )
follower rod ( timing , but prob'ly least important on list )
clip latch spring ( often ejection problem )
op spring ( cheep )
Should set you up quite nicely.
Chris