I was at my wits with the handling of my 07 WRX wagon to the point i was thinking about selling it.
Got some whiteline stuff fitted (arb's, drop links, ALK and lower springs) and the geometry set up properly at hypertech, i love driving the car now and look forward driving the B class roads when i can.
I woulden't say you need to fit all but at least think about the ABR's, drop links and geometry set up.