I'm curious what this model has that the others don't. So far through searching I've come up with;

-Rear Disc-Brakes
-LSD
-6-Port 13b
-Power Windows
-Power Steering

 

-Common bolt pattern (4x114.3 +40)
-EFI

 

-standard sunroof/moonroof
-14 inch wheels and tires
-different rear gear
-NOT power steering, it was just optional

Great link for model and year differences:
http://www.geocities.com/MotorCity/S.../firstgen.html

 

Dont forget porbally one of the best motors Mazda made... 3mm apex seals

 

GSL's came with lsd and rear discs. Power steering and power windows were also available on GSL's. SE's came with the 13b, 14" rims, larger diameter discs, different rear end ratio, taller 5th gear, tweaked suspension. Most everything was standard equipment on an SE. Your only options were leather and power steering.

 

Don't forget that the SE discs were vented. My '83 has solid rotors.