all down to personall preference mate!
in general, stick the all the cleaning/detail products from the same brand where possible. makes things easier during application etc, and you know what type of finish to expect.
i stick to AG as well. the Super Resin Polish brought out my mk2ph2 (silver) a treat.
i think i have the same kit. lol. The only product im dissapointed with is the shampoo. it doesnt foam up enough and it take a good scrub to get grime off if i havent washed it for a couple of weeks.