Check out the Chargespeed rear arms kit. Same as STI with the pilo bearing bushes and spherical links but it has adjustable lateral arms. And they are painted Blue. Matches the rest of your car
And what ever swaybars you go, Id recommend equal diameter front and rear with the rears being adjustable. Your car is pretty taily as is, so Id want to neutralise it little. And dial in some more toe-in on the rear wheels.