Two baking related brands that have earned my loyalty for life:
King Arthur Flour home page Love, love, love their unbleached all-purpose and bread flours. I switched from Gold Medal a couple years ago after my local grocer started carrying King Arthur. I do think the quality of their flour makes a difference in my baked goods.
and
Bob's Red Mill
Love their specialty flours, specialty grains, and especially the giant bag of steel-cut oats they now sell at Costco. I also love that they're a local company.