I have braided hoses and Pagid yellow R29 pads on mine, its fine on track but squeaks a bit round town
Give that a go first, its the stage 1 brake mod!
I think going for the AP upgrade is prolly worthwhile if you plan on driving a lot of fast tracks (like Spa) I plan on going to the ring a couple of times but its been said that stock CSL brakes are fine there as its a flowing circuit.