Get a parrot system. I just paid for one yesterday.
Here are the different systems.
I would go for an MKI system either 9000 (no screen), 9100 (small LED screen) or 9200 (larger color display). You can stream via bluetooth from your iphone, or hook up your ipod via the cable. You also get bluetooth handsfree calling. Plus with a ~30 dollar adaptor its an easy plug and play system.