Kauffman's & Whitaker's are the best for chicken and great customer service. Whitaker's chicken chorizo is amazing! Both hand-trim their meat so while you may be paying more per pound than a grocery store, you're not getting chunks of useless skin & fat.
I prefer Shadi's produce and/or Boutros. Shadi's has these cucumbers that will make you never want a grocery store cucumber again, and he will give you great recipe ides. Both vendors Boutros & Shadi, have fresh items that don't go bad n 2 days. Unfortunately, some other vendors' products aren't so great - the go bad asap. I like Marina's too for her pepper selection!