What are your favorite GBA games that you still play on your DS?

I love that they have Final Fantasy on the GBA, I have FFV right now and plan to purchase FFVI, FFTactics, and the other (for the life of me I can't think of what the fourth one was, I have it on my PS though so go figure).

I'm also always a fan of the various Mario and Zelda games, so I'll probably buy those after I get myself a carrying case; right now I have everything in a Tupperware container, because I am just that ghetto... lol