I'd recommend a Zeagle BC. They just made a custom section to fit me (58" waist, 56" chest, long torso) for a Brigade that's waiting for me at ScubaToys.
Other alternatives are a tank pack with horsecollar BC mounted around the tank, otherwise called a BP/W. :11ztongue (If you're curious, my biggest objection to BP/W isn't the philosophical Rec vs. Tech debate, but that parts equivalent to a tank pack and horsecollar BC cost several times as much when labeled as a BP/W, especially from the 'boutique' manufacturers. And yes, a tank pack and horsecollar BC are both still available as new items.)
There are several commercial BC's that are rather large, for instance, you would probably be able to wear a XXL ScubaPro KnightHawk or XL SeaQuest Black Diamond without much trouble. I have an old XL SeaQuest Spectrum 3 ADV that actually still fits me, but isn't weight integrated and is prone to squeeze (It's a jacket style BC.) I tried on both of the mentioned BC's recently and except for the waist, they fit me fine.
It really depends on how your LDS can help you out, and if they can't, I'd recommend the guys in Texas, who seem to be able to do anything for anyone.
Tachyon