Now that Shu products are no longer available to those of us in the U.S. except by online order how would one determine the proper tint/shade for foundation?!? Does anyone have some advice or comparisons? For example, if I use "nude-" colored Laura Mercier tinted moisturizer, then which Face Architect Foundation shade may be appropriate? I know it's less than ideal to purchase w/o actually testing the product, but since that's not currently an option ...