From ploughing through the forums I believe the Toshiba and Panasonic SD cards are the only ones to bother with for speed and reliability (correct me if wrong). I bought a Toshiba 256 for £37, though Panasonics seem to be around £60!
Thanks for the response. I'll consider these two, though it would be good to know you'd sorted your possible Toshiba problem first
Lookings at products available form ebuyer.co.uk, I found:
The Kingston Elite Pro line of Hi-Speed SD cards support 4 bit data transfer at up to 10Mbps - 5 times faster than standard SD cards (standard SD cards support 1 bit data transfer).
Is this supported by the Zaurus & is that what makes the difference? If I can confirm that it'll make shopping easier
Incidentally, ebuyer have the 128MB Kingston Elite Pro at 42ukp. This appealed to me as I find their SDRAM very reliable.
The price & size differences make me wonder if this is a red-herring; in which case I'd imagine the 4 bit data xfer will either result in even better performance than Tosh/Pana, or if it turns out the Zaurus doesn't support it, a waste of money :/