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.