All in one mp3 storage/dvd/nav system?

So I've been lurking around here for a while, and I searched the forums for days looking for any advice, but I didn't find any (although I did find some other useful stuff).

I just picked up an older Caddy with low miles and I figured it was time to do an install.

So I decided on a few things:

1) I need navigation
2) I'd like a DVD player (though it's not imperative)
3) I'd be willing to custom fiberglass a bezel so I can fit a double-din HU (thus, #2)
4) I have over 150GB of mp3s that are looking for a home, so I'd need some type of hard drive thingy to connect and interface with the HU.

Looking around, I only found 2 solutions.

1)Kenwood DDX-___ with an accompanying nav. system, and the Music Keg.
2)The Eclipse AVN5495.

Can anyone suggest anything else, or knows of anything else out there that'll work? I realize I could get a seperate double din DVD player, and a Garmin dash-mounted GPS and an iPod, but that's sloppy looking. I'd like for everything to look as streamlined (hidden) as possible.

Anyone?