My car has the AUX in adaptor from Becker and a Monster Cable RCA to 1/8" cable to attach my Ipod :
http://www.beckerautosound.com/Porsche/99_01_carrera_cdr220_cd_4462.html
http://www.monstercable.com/productdisplay.asp?pin=4932
There is no power supplied to the Ipod, and no alternator whine.
When I used this same setup to connect my satellite radio, I did experience whine since the receiver is powered through the cigarette lighter.
I have since had the satellite radio permantly installed, and Tweeter told me they did install a ground loop isolator to stop the whine.
So clickman, I would get the parts mentioned above rather than the parts linked in your original post. You will not be able to power your Ipod, but you won't have any whine either.
If you need power as well, I would look into using a ground loop isolator with the PIE connection.
Hope this helps...
Nick