Hey mate, you won't be able to extract much power from an N/A in regards to performance. If your not planning on keeping the car and looking at possibly buying turbo model later down the track I would just go for lowered spring i.e. Tein S tech.
As for rims I would personally buy second hand as it will generally work out alot cheaper than buying new.
And as said previously, do a search as there is heaps of information on SAU.