Try this Todd. I think you are recently Vista, yes?
Cirlinca DVD Audio Might be what you are looking for and a good deal at $35...
EDI to add...I dug a little deeper and found:
DVD-Audio car systems
Alpine IVA-W200 / IVA-D100 / IVA-D310
Pioneer AVH-P7800DVD
Panasonic CQ-VD6503U, CQ-VD7003U
JVC KD-AVX2
Cars with DVD-Audio sound system
Acura RL, TL, MDX
Lexus LS, GS, ES, IS with Mark Levinson audio system
And you may find more info on
these fourms.