Catching Fire Movie Cast...Suggestions, Please!

I need thoughts and suggestions from my Catching Fire fans before I create a Catching Fire cast list. Who do you picture as Finnick, Johanna, or Nuts and Volts? The new characters are making it tough for me to create a cast because I can't quite find anyone who perfectly fits the part or age range. A little help would be greatly appreciated! So far, I've only thought about Finnick...I wonder if this is because he is bronzed babe in the book? Could be!

I like Robert Buckley from Lipstick Jungle, but I'm not sure I have the age of Finnick right. I'm thinking he is 24-25ish if he was 14 and the 65 annual Hunger Games. Is that right? Buckley is 28 years old, so if I'm thinking of the correct age for Finnick, then I'm in the right celebrity age range. Most actors play younger men in their movies, so the difference between 24 and 28 isn't all that great on the big screen. I was also thinking of Jessica Biel for Johanna, but Bield doesn't have the dark eyes that Collin's describes in the book. I guess if Kristen Stewart can wear brown contacts to play Bella, then Biel can for Johanna. What age is Johanna? I need to reread Catching Fire to make sure I'm thinking in the same time frame as Collins. I'm imagining her to be no older than 30, athletic and attractive. Any suggestions beside Biel? You can find my other cast members on my HUNGER GAMES MOVIE CAST LIST. Also, check out Entertainment Weekly's recommendations for The Hunger Games movie!