I'm upgrading to the dsi

Simple question really which is the best flashcard for the dsi. All I really require it to do is play games and I want to use it for ebooks also. That being said I obviously want it to be as user friendly as possible.So what do you suggest?

Not to be rude, but this topic has been discussed numerous times in the forums. The answer is pretty much always the same.
Try reading a few of those older topics, search for "best flashcart" or "best flashcard"
https://www.romulation.org/forum/index.php?action=search