if you are buying private, then definitely get an AA inspection because it is worth it
i think there is quite an even spread between SE and Sport owners, personally i only bought an SE because i wanted an Auto.
Its basically because the extras you get on the Sport over the SE are:
Tinted windows (B-pillar backwards)
Limited slip rear differential
Stainless steel pedals
Two tone steering wheel (black and grey)
Rear lip spoiler
The newer cars have lowered suspension (not too sure)
One insurance group higher (i think)
Therefore, if you don't really need any of these things, you can save a little and buy the SE