I use everything from Arkostick on the low end (Amazon has it for about $3) which I like for traveling, specially to Pre de Provence soap or Taylor of Old Bond Street or DR Harris Arlington cream (which is my favorite). Like others, I'm sure, I've bought about 15 of a large variety, and found it's an expensive way to experiment. Google shaving soap samples, and you find some vendors online that sell small assortments (including SRD).