My suggestions:

"This ain't your fathers CD-Player" (it's an american saying)
"Own the future of Car Audio now"
"Empeg Car - Finally a reason for driving" or "Empeg Car - The Reason For Driving"
"Empeg Car - Home of the 4000 song no repeat year" (parody of the US radio's phrase "Home of the 12 song no repeat work hour")
"Only 2000 years to prefect Car Audio"
"Empeg Car - This thing is better than sex"
"When you're tired of hearing the same song twice - in a year"
"And Sony though 12 disks would be enough for your car"
"Sony: Mini-Disk it's dead now" (that might piss'em off a bit much though)
"CD - Been There Done That"
"The Biggest Little Head"

Those are mine...

David
[email protected]
http://dmoore.com/empeg.htm