Looks to me like the speed of the card makes a small difference.
I bought the Lexar to get a high capacity card that I could use in a DSLR (when I save up for it) and also save battery on RAM vs rotating disc.
While the Minolta will accept fast cards it doesn't support WA so I don't get 40x speed
But nearly a 25% reduction in single image save time is worth it.
Lexar Pro 40x 1GB
1 image saved 15.5, 16.8, 17.4, 17.8, 17.9
3 images saved 40.7, 40.8, 44.3, 48.8, 49.8
Sandisk 256M
1 image saved 18.4, 20.0, 20.6, 19.8, 19.2
3 images saved 51.5, 54.7, 53.6, 53.8, 51.3
Microdrive 340M
1 image saved 23.4, 29.1, 27.0, 25.6, 22.9
3 images saved 59.3, 60.4, 63.4, 67.1, 52.9
Microdrive 1G
1 image saved 23.1, 26.1, 25.1, 25.2, 24.5
3 images saved 65.5, 65.3, 61.0, 63.5, 52.7