Oh, I know the ones I want hacked the most.
Over The Edge both the old ones and the new ones. I lvoe the flexible and background focused and it's very flexible.
Unknown Armies I think there is a lot of potential from the madness meters and the way it handles that stuff.
Puppetland it's diceless but I love core mechanic of what you can and can't do and the slow fading of your character when you get injured or act outside your nature. You literally have a drawing of your character and black out a piece of the drawing each time.
But most of all: Hot Guys Making Out I love the core resolution mechanics and how it has what your character is "good at" and "able to do" and the difficulty acting outside of your roles.