You can get satellite radio. If you're the original owner and you didn't get satellite radio when you bought it, you can buy the receiver and antenna and have it installed or do it yourself. The receiver plugs into a harness in the trunk. If you aren't the original owner, then I would suggest looking in the trunk to see if the receiver is there or not. It would be a box under the carpeting and then under the plastic on the left side. If it's there, you can just order up a subscription.
If you decided to go the iPod route, it is plug and play with a little bit of surgery. If you go to
http://www.everythingg35.com you can find an iPod adapter with a set of instructions posted. They are a good company to deal with.