SS 1.6 A/T has..
CD Player (others have Cassette player I guess)
6 speakers instead of 4
Glass embedded Antenna
Rear Cup Holder x2
Sunvisor Assistant with Mirror + Lamp
Instrument Panel Type Wood Grain
Door Inside Handle Lever Plated
Rear Seat Arm Rest w Storage Box & Cupholder
Tyres 185/65 R15 with Alloys
These features are not in the other classes and above of all this particular model's price was not changed in the recent price drop, otherwise it would have been lower too.