Can you say wasteful spending?
I'm not here to troll or anything, but if you REALLY, REALLY want an Xbox original, you can probably find any of those games for about $4 or $5, and from what I've heard, they will run better than their milkotransactional spoiled step-brothers on XBL. Not only that, you're spending TEN DOLLARS (read: $10) on 3 MAPS that will be free a couple of months later and really won't improve the gameplay.
Listen, you have 4,000 points. You can buy up to 10 excellent real original games on the Arcade, and yet you choose to spend it on drek. If I were you, I'd go for Geo Wars, Uno, Puzzlequest, Marble Blast Ultra, Boom Boom Rocket, and Pacman CE. Will get you way more play time than what you're buying.