Dino: Only have the black, white, and orange...love all three

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evenflow: I used the Liquid. The front wheels had some baked on gunk, but paired with my PowerPuff, it came out wonderfully. I love the P21s Wheel Cleaner...very very safe yet very effective.
Bryan: I am not familiar with the Green P2 pad, but I'm sure Eric Dunn and LC could help you better with that question.
I like having the trilogy of pads, meaning 1 cutting, 1 polishing, 1 finishing. For *my* feats, orange, white, and black fit the bill. I just ordered a yellow to try to see how it fairs but I like the density of the orange foam a lot.
My pads very very rarely gum up now. I might brush clean them twice the whole compounding stage on the rotary (1 pad). For polishing/finishing with the PC, I replace them twice for the reasons stated initially, mine being too thin for PC use. I ordered a couple white PC thickness CCS recently too so I'm sure they should help.
Lee: Eric Dunn could help you. I was able to purchase through him.