Spring spacers (fits between the coils of the spring) are illegal in Australia & are a really bad idea.
Strut top spacers are the best way to lift, they keep the factory suspension travel & have inbuilt camber & caster compensation.
I recommend stock suspension or Kings standard height springs & KYB struts. Don't do raised springs, they give a harsh ride & reduce articulation offroad, meaning less grip & more wheel spin. Stock suspension is the best for offroad, with a nice ride on rough roads & the best articulation.
If you carry heavy loads, do Kings standard height springs & KYB struts for the rear with stock suspension front, with a 2" lift kit & bigger all terrain tyres. This gives you heaps of clearance, more than most 4wds, while keeping the good Subaru handling & reliability