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Okay, then your computer at least meets minimum requirements. I'm not sure how to answer the question of worth.. My understanding is that in order to play the game you'd have to either upgrade the OS or play in Windows bootcamp, since EA states that the game isn't supported on the older Mac OS. Maybe someone else can comment if they've actually tried it on the older OS, but I'm just going off of EA stated requirements.
The only thing I'd be concerned with is your lack of RAM. Even with Windows XP, which will take less than 512mb to run the OS, people are needing about 2GB total to be stable. That means that the game alone appears need about a max of 1.5GB of free RAM. So, you do meet requirements, but there's no guarantee that game play will be perfect even if you spend the money on the new OS.