No @ models being cast for parts. If we can cast great actors like Robert Downey Jr., Christian Bale, Tobey Maguire, etc. for great leads in their respective superheroes, why should a female superhero get stuck with some supermodel who doesn't know how to act?

I agree. There is no point in making White superheroes Black. Its like people forget that there are many good Black comic book heroes too, why not work with them? Its like people don't know this or bother. If anything, that's much better, it gets them more attention to the mainstream attention and appreciation. Like someone said, we've had Blade. There's also Spawn (we can try this again) Vixen, Black Panther, Green Lantern, Storm (solo) etc.

 The problems with a Wonder Woman movie are a) finding the right woman to play her, b) the plot, and c) the villain.

I put finding the right woman to play her first because that's going to be the hardest.  She has to be tall, curvy and very well-toned.  To be credible, WW can't be six inches shorter than any of the guys she's interacting with, so I'm thinking she has to be 5'10 or taller (which eliminates a whole lot of actresses--Morena Baccarin is gorgeous, for instance, but she's a little too short, I think).  Curvy goes without saying; she's got to be able to fill out the outfit.  And, much as  I love Lynda Carter, the one thing that always drove me nuts about the TV show was that she had these pipe cleaner arms (especially in the first season).  Basically, whoever they get has got to get into the gym and do a lot of upper body work and leg work (given the outfit, she won't need six pack abs).  In other words, she has to look like an Amazon.  As for for actual women, of the ones I've seen, Megan Gale is probably the closest; have her adopt Jessical Biel's arm and shoulder workout for 6 months and she'd look perfect for part.  But can she act?

The plot is a problem, insofar as you have the issue of whether to do an origin story.  Though WW is one of the iconic superheroes, I suspect her origin is probably the least well-known to the general public, so I think the movie would have to address it in some way.  And, in doing so, do they give her a WWII origin or not?  A whole superhero movie set during WWII might not have the same appeal as a movie set in the present (you can't help but notice that they moved the series up to the present after the first season).  Maybe they might be able to do a opening credits sort of thing like they did with the recent Hulk film, showing her origin in the form of newspaper headlines and newsreel clips, so they can start her in the 40's and move her up to the present in quick order.

I'm putting the villain last because I think that follows from the plot.  She's never had a nemesis with an iconic status (like Lex Luthor or the Joker), but I'm not sure that's a problem, as Iron Man showed you don't need an iconic villain.  But, as I said, it follows from the plot.