I use my system for Sirius more then anything else. I had an Alpine in my old car, and the Sirius control sucked!!! I then got the Sportster 4, and that works great.
If I get a Double Din system, I don't want a separate device to control Sirius. The things I like the most about the Sportster, is multi line display, being able to select favorite artists, and the ease of navigating the system. I hear the Pioneer D3 has only a 1 line display for Sirius, but multi line for XM. What a waste of space.
I have read a lot of reviews that say they had to send the Pioneers back due to a bad hard drive. I have also heard great reviews on the Kenwood (Garmin) Nav. I have a PPC-6800 Cell phone, and found that with a hack, it connects with the D3 well.
Any info would be great.