I'd like to start with a disclaimer: Joey (Smokinfast) is way better at this stuff than I am. All advanced questions should point to him hahah
That said, you can see the particular products I use here:
Joey and I are both Meguiar's fans. Since I posted the claybar DIY, I've switched over the Meguiar's Claybar kit (which also includes a microfiber and actually smells even more addicting than the Mother's kit). I know Joey tends to buy his stuff from Meguiar's directly; I happen to just grab whatever I can off the shelf at Pep Boys.