Good question. I did mine as a factory order, but thought I save some money and go for the Radio Boost CD. I thought they would be the same, only with a different display, but later on I found out that with your PDC you would get a visual feedback with the Visual Boost as well. And you can see Album Art and would be able to watch videos from your iPod or iPhone. So I'm still not sure if I had made the right decision there. Time will tell.
It would be good to know if I could chance it later on to the Visual Boost, in case I regret my decision.
I've ordered the Full Bluetooth Pack, so everything but the MINI Connected and the SatNav would work.