Personally, I would have a hard time using panniers unless my trip exceeded 15+ days total, had resupply points more than 5 days apart or the trip required extreme weather clothing and shelter. However, if forced to use panniers, I would be calling Pacific Outdoor Equipment without second thought.
Jeff at Carousel Design Works was nice enough to provide me with the bags featured in the most recent Overland Journal Gear Guide. They're pretty amazing bags.Other new style rackless bags are made by Carousel Design Works in Sonora, Calif and Epic Designs in Alaska. My rear stuffer comes from Carousel.
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In 1986 I broke a Blackburn front rack at 5000meters/16500feet in the Andes of Ecuador. I replaced it and the rear one with Bruce Gordon CrOMo steel tubing racks.