Yeah MS-PRO-DUO's (8gb) Retail at about $100 here,i found with my PSP that the sandisk had faster transfer rate than the Lexar,but lexar's are normally cheaper.
Lexar is only $5 than the Sandisk cheaper here in the US.
But Circuit City is selling the Sandisk for $40. Which is $5 cheaper than the Lexar from Micro.
From my experience in transferring large files, the Lexar is faster. I might just get the Circuit City one for $40, its pretty cheap.
I thought you were talking USB flash drives, but it's about the same thing really, just different media. I think you'll have luck with most any brand of flash media. It's all worked fine for me. I have a Lexar SD card and I think a SanDisk card in my phone. Haven't had probs with either,
I have a Sandisk Cruzer 4gb thumb drive and it's good. As far as flash memory is concerned, I don't think it matters that much what brand you buy, they are all basically the same as far as I'm concerned.