If you want SD, you'll need to buy an M3 SD for the best of everything. It has stellar GBA (probably not 100%, but not very far from it), browser compatibility and external memory (SD, obviously).
No other cards fit your description. The supercard SD GBA isn't as bad as some people say it is, but its definitely not up there with the others.
K, this seems like a nice one
Is it this one?
http://gbatemp.net/index.php?showtopic=31165
Could U give me a few sites where I could buy that flashcard, cuz I dont find one...
And I have a DS Lite, but it doesnt matter if it sticks out to much...