Nothing wrong with Natu or Iolande, I'd be more than happy if they were in a GL movie. I just happen to like the classics a little bit more. I wouldn't mind seeing Purple Psylocke Green Lantern (aka Purple Psylocke Red Lantern), either.

In all honesty, the female Lantern I'd want to see most is Jade, but not in a movie without Kyle.

 

Ideally I'd want the movie written by Geoff Johns. He's got the best grasp of the character. Heck if they did the current origin story he's writing it'd be great.