in my opinion, in order
-good tires: make more difference than almost anything
good brakes: almost never on the top of peoples list
swaybars: another huge difference and so cheap and easy
coilovers: agree on mca, dont go stiff rates, it does not make them work better
eliminate hicas: becuase its dumb
new bushes all round: pull out the subframe because again its just going to come out at some point, do this step properly and spend the coin
adjustable arms: to be done with the subframe out and when doing all bushes.
proper alignment: setup for how you intend to drive.
coilpacks: lets be honest we all end up buying them
exhaust: we all like a good exhaust, do the dumps/ front pipes too, cat back only a fart with no power gain
then into the power side: turbo, ect, fuel pump, injectors tune yada yada.kis your money goodbye
just my thoughts