Miss Fortune Items

Now that we have a new item set creator, I'm working on various builds. I'm a little confused by Miss Fortune's default set. MF gets a boost from AP on three of her abilities, including a large boost to Make It Rain. Wouldn't it make sense to have the Hextech Gunblade at least as an option? It seems like a waste not to make use of the AP potential.

I've currently set up a build for her. And if you think that's dumb, you should see what I'm planning for Sona and Janna...