Hi bud, you are no more confused than most dealers  
  
If we start with UK models and Imports then this will help. 
http://www.350z-uk.com/forum/viewtopic.php?t=13288 
  
And the differences between UK and Import 
http://www.350z-uk.com/forum/viewtopic.php?t=1781 
  
With the UK models there are basicallt two options, Base ot GT. The GT has Rays alloys, bluetooth, cruise control, leather interior and Bose stereo so the options down to your taste. 
  
There have been various facelifts over the years with the 07 car having a raised bonnet and more horsepower.