Most cast brands will have the same amount of concave. The wheel specs are all pretty much the same, so there will never be inches of concave difference. If you want deeper concave you need to run wider wheels, so something like a 18x10 or 10.5 in the rear, but then there aren't many companies that offer that. Forgestar would probably get you the deepest concave since you can get them in wider widths.
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