I use the CG pads, i bought a range of them from orange to black and they seem decent tbh, the 4" are classed as spot pads and are for smaller areas such as bumpers on the golf, as the golf has mainly large flat-ish panels i'd go for the 5.5" ones mainly, perhaps green, white and black depending on how bad the swirling is, if it's quite bad then you may want to think about a polish to add to the micro prime which is (i think) more of a pre wax cleanser?
Oh and you should be fine with the red pad for wax, although i would consider whether it's worth paying for the megs v2? Some cheaper alternatives around for what you need it for.