Your Experience...different Sd Card Brands

[scoobydew]

Hi all, I was curious what SD card brands you might recommend and which you think are the ones to avoid.
I saw on ebay that they now come in 4gb(Adata brand) sizes also and I was interested in buying either a 2gb or 4gb size secure digital card for my GP2x when it arrives.
Just wondering what you all think about them.

Thanks for the input.
Regards, Joe.