pete - OI and Bengal Slices are the standard for heavy Lat flakes. In addition to the items above, if you are looking for similar flake formats, the European blends like McConnell's and Germain's may suit you. SG's Navy and Balkan Flakes come in those nice stately flakes but have lesser amounts of the evil weed. Now, cakes give pretty similar slow smoking characteristics if you don't rub them out and there are a lot more choices: H&H Ten to Midnight, C&D Bow Legged Bear and Pirate Kake, Serad's Longevity II (original had the Syrian and is now gone), most of Hermit's Captain Earle's excellent lineup (Ten Russians being the most potent, but Stimulus Package and Mystic are favs), Smoker's Haven Krumble Kake, Seattle PC Mississippi River and Plum Pudding. With broken flakes there are even more: Low Country's Cooper, Blakeney's Best Latakia Flake, C&D Tuskegee Airmen and Star of the East and Sunset Harbor Flakes, Lancer's Slices (a Best Buy), GLP Sextant and Quiet Nights.
Going offshore and into maybe discontinued blends are Larsen's 222, Holly's Discovery and Bjarne's The Special One.
If you could narrow your preferences in terms of strength and presence of Orientals, I could be more specific.
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