SanDisk's Extreme IV CompactFlash cards
CF cards come in sizes up to 8GB, and offer speeds of at least 40MBps, not to mention the extreme environmental conditions they can suffer through (-13°F to 185°F). The cards are surprisingly affordable, however, weighing in at $160 for the 2GB, $320 for the 4GB, and $640 for the 8GB. Perhaps it's overkill for your puny mid-range DSLR, but from the looks of it you'd probably hang on to this memory card a lot longer than your average digital camera.
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