Of what I know,
DX - basic version with black bumpers
GL - fully loaded i.e. power windows, power & tilt steering, central locking, matching bumpers, etc. and
SE Limited - The same but with maroon and some times, blue interior. SE Limiteds also have garnishes between the main and number plate lights.
This is the way I think them to be. I may be wrong though but m pretty sure DX is the basic version. Maybe Levin could come and shed some light on this.