I have both the DAS and SFX pads.
DAS seem better on good shape finishes, where as the SFX pads are more dense and foam seem more aggressive on more wethered cars.
I would say you need 2 cutting pad, 2 polishing and 2 finishing Pads to start you of.
The SFX spot pad kit is well worth a buy to. Ideal for Clios and smaller cars.
As for polishes I much prfer the Poorboys SSR Swirl Remover line but Autopia dont sell them. Not tried out the Sonus range of polishes from Autopia so cant really help on that one.