Don't panic, we're going organic. Well, this week, anyway. It's time to grab that shopping list and see whether Whole Foods Market (NASDAQ:WFMI) rings up for you. Some would argue that the company's pending merger with Wild Oats (NASDAQ:OATS) will help Whole Foods improve margins at its struggling rival. Others feel that too many traditional supermarket chains like Ruddick (NYSE:RDK), Great Atlantic & Pacific Tea (NYSE:GAP), and Ingles (NASDAQ:IMKTA) are expanding their shelf space of organic foodstuffs, eating away at the necessity to drive out to Whole Foods.