what year is it ?
anti lift kit helps a lot more in the classic shape than it does in the bug/peanut eye shape, but every little bit counts. Also worth looking into getting some more camber on your front wheels, greatly affects in corner handling. your cheapest option is some whiteline camber pins, people have mixed opinions on those, i'll let you form your own, then adjustable strut tops for your stock suspension and most expensive would be coilovers with adjustable tops. more camber will of course cause you to wear the inside of your tyres more.
Upgrading your rear swaybar is a tops idea, or go for a matched pair for even better handling

__________________
MY93 Impreza GX 1.8L, 0hp, 0nm