TBH Having now run the SX3 for a couple of months i would say there isn't much you need, depends if you want the extra tweeks etc...
7.5 deg caster blocks are the norm
I don't bother with S1 chassis, but do use the top decks.
FAB system is not really needed, depends on your driving style. I have it but it has been locked from first meeting.
If you want to strengthen the car then Alloy gearbox tops, but you will need to purchase a couple of shocktowers as these will break instead. Otherwise not much you need in my eyes.
Car is really good and i am sure you will not be disappointed.
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