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Maybe the bug is inside the chip, so I think you can transfer to use NAND flash-based card, such as Compact Flash, SD, MMC......
In fact, it is inevitable to meet bad block in NAND usage, while NOR is more stable for its high cost.
You can never balance the performance and price to a golden point, but I think you can have more options in the future. You know, ST has released Samsung NAND compliant flash chips, maybe you can try it. Furthermore, M-system's DISKONCHIP is a good choice, however, it is Toshiba NAND inside.