I have the stock infinity in my V10, works good for me. As for a head unit, I have a dual from wal*mart, has the HD, bluetooth, and Ipod (usb) control. The remote controls the ipod, and also will dial the phone. Oh, it also plays c.d.s, but I don't think I have ever used it. IIRC it was like $140.
2000 XJ with a 3 inch body lift