Fosgate had a 350Z at the CES show.
http://www.rockfordfosgate.com/home
Don't know what to say about it except or or depending upon your tastes.
But the Omnifi sounds cool.

 

 

I was lucky enough to see the rockford Z in person at the CES in Las Vegas this past Jan. The install is very impressive. Not for my car, but for what they are using it for dead on the money. They had a video playing next to the car showing step by step of the install. The most impresive thing to me was the custom grills. They were maid of plexi, and aluminium accented by LED's. They were made on a C&C machine.

 

...and silly me I left my LSD at home.