This kind of stuff has already been discussed in the General MMA section (where this thread will likely be moved soon), but I see no reason it can't become a productive thread.
There are some pretty under utilized styles in MMA though. I think Judo will be more heavily used in the future for example.
And if Savate could be adapted to use perhaps the flat part of the foot instead of the tip (usually requires special shoes) that could be effective. Except you'd risk breaking your foot if you missed the target.
And you can go to youtube and check out the Fight Science episodes where they take practitioners of different martial arts (including Ninjutsu) and test them for comparison.