i went with orange, green and black in 5.5" and the same for the 4" pads 'cept i got yellow as well for certain heavy cut situations.
didn't get yellow for 5.5" because Hyper compound, orange pad and a powerful machine is absolutely as aggro as i'd ever need for large areas.
the exact breakdown for my first B&S order last summer was:
1x 4" yellow two pack
3x 4" orange two packs
3x 4" green two packs
2x 4" black two packs
5x 5.5" orange
5x 5.5" green
2x 5.5" black
if you get yellow and orange, you'll notice that yellow seems less aggressive than orange. it feels that way but trust me, it isn't.