The person already said they were getting SSBM. Also, Mario Kart is a good racing game. Have you played it? I don't know; no one who has ever has said it's crap. Not Double-Dash OR any of the previous games.
Also a must is Super smash bro's melee which is probably the number one game for the GC. Its awesome and is the best multiplayer game and just rocks. Its the only multiplayer game you'll need.
Also the GC has the best racing games so yeah get a racing game of your type :) unincluding the shithouse mario kart double dash which is simply crap.