What are the best GBA games?

I bought a GBA SP at goodwill the other day for $1 ( it had no price tag so I bargained with the lady). I dug up my games but i could only find 4: Zelda: A link to the past, which I have beaten, Zelda: The minish cap, Mario kart, and Texas poker. Can anyone recommend any good games that would be worthwhile to buy from the used game store?