Not as hard as I thought simply cause when my car still had a five disc changer in it, I ended up creating reserve spots for CDs I refused to remove from my car.

Daft Punk ~ Discovery
Gorillaz ~ Demon Days
Yoko Kanno ~ Macross Plus OST Vol. 2
Panime Best of the Best
Mitsuda and Uematsu ~ Chrono Trigger Original Soundtrack

That would probably do it for me though if I could add another five...
Gorillaz ~ Plastic Beach
Yoko Kanno ~ Cowboy Bebop: Blue
No Doubt ~ Tragic Kingdom
Billy Joel ~ Greatest Hits Vol 1/2 (Its sold as a single album)
David Bowie ~ The Rise and Fall of Ziggy Stardust