u dont need a 33 rear end and u dont need to spend a heap of money
my aus spec 31 set up was, spool diff, full s13 coilovers, RB30E+T, a good 5 puk clutch afew sway bars, lightly striped and a good tune 180rwkw with something crazy like 700nm
all up the set up cost well under 8k on the road and destroyed s13s, 32s in the same price range