1543, in my experience different governors are the best for different people due to different usage. If you're a heavy gamer, I would suggest Performance, considering it'll stick to the highest frequency to process and render the game. This governed doesn't have any toggables or anything of that sort, so it'll save battery by not checking the usage of the CPU of the phone, checking costs battery. If you're a light user (Web browsing, email, no Facebook, etc.), you might want to use zzmove, luzactiveq, or hotplug.
For IOs, I'm not really sure. Google is your friend.
Again, these are just my recommendations, you should do some research and test each of them out before finalising on a governor or IO.
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