I NEED A NEW LAPTOP!!! I NEED CRITICAL HELP!!! And what kind of Antivirus to keep it protected?

I need a new laptop after my Dell Inspiron 1515 died on me (like CRASHED), and i was looking at a Macbook Pro 17 inch. I have over 5 GB of music on iTunes, over 10 GB videos on iTunes, and a bunch of pictures of family, friends. But ALOT of memory. Also i like to browse the web. PLEASE HELP!!!