If there's one reason to consider the 1.8 SL version of the 2007 Nissan Versa, it's the availability of certain options. In particular, upgraded speakers with a Rockford-Fosgate subwoofer can only be had with the 1.8 SL, as is the case with XM or Sirius satellite radio. That's above and beyond the standard 180-watt sound system which includes a six-disc CD changer, MP3/WMA player, and an auxiliary jack for your iPod. Basic radio controls include a dial for volume and buttons for seek and tuning functions. There are also clearly marked, easy to use audio controls on the steering, but again, these are features unique to the Versa 1.8 SL (when equipped with the Convenience Package).