The Pontiac Vibe doesn't vary through trim levels, but several upgrade packages may be applied to the standard equipment.  All Vibes include air conditioning, 16-inch wheels and a CD audio system.  Buyers can opt for the Preferred Package, which adds full power accessories, keyless entry and cruise control.  The Sun and Sound Package includes a sun roof and a premium audio system.  A Sport Package and several stand-alone items are also available.