I changed pads only to Pagid RS29s and added stainless brake lines and better fluid. Everything else stock still. Made a huge difference on track BUT not at all recommended for road use as they squeak like hell and need hard application when cold.
If you track the car regularly, do it. Otherwise I'd just get uprated street pads.
Works done by BM Autowerks in Melbourne, who were good. Don't ask price as I can't remember and would need to dig out an invoice
very reasonable though!