The man to answer your question is Alpman.
I will offer my 2 cents (worth less than one actually), but an Alpine headunit that works with the KCA-420i (there are a number to choose from) should offer some great functionality with your iPod.
I will offer my 2 cents (worth less than one actually), but an Alpine headunit that works with the KCA-420i (there are a number to choose from) should offer some great functionality with your iPod.