Originally Posted by USERBOSCO
Lastly, just to be clear, if I'm using a portable MP3 player that doesn't use the cars 12V DC power (AKA: cigarette lighter juice), do I need the GLI?
If you're not powering the MP3 player in any way by the car, a GLI is completely unnecessary. I also haven't noticed any problems with heat...there's a lot of open space behind the CD player that might be helping to keep temperatures down whereas most vehicle's stereos are packed into the dash very tightly.
I'll let others offer up wishes & wish-nots, but essentially, I'd do the install with an eye on the future. If you think you might add XM at some point, or an MP3 charger, just set it up as best you can for future flexibility.