I just installed an Alpine cda-105 with the power pack (in-line amp, 40w rms) and even with stock speakers my truck made sounds it's never made before!
The ipod integration is awesome! Although I have nothing to compare it to, the functions are easy and it's quick to find what your looking for.
So... next on my list in the coming weeks will be some speakers+mounts from Mr. Marv and deaden the doors.
HU with metra dash kit:
The fit of the metra is acceptable, but not anything to rave about. I guess you cant really expect much from some aftermarket plastic.
Alpine power pack:
All those wires are from the power pack because the factory radio harness plugs into it and then gets passed through to the alpine HU. I need to get some zip ties back there. The black wire is the USB cable, I still haven't decided where I want to run it.