So I broke up with my girlfriend a couple of weeks ago, and since valentine's day is coming up, i figured I'd celebrate not having to do anything by taking the money and buying a Diablosport Predator for my car

My question for you guys is as far as the canned tunes that it comes with, how much difference am i going to see between the higher octane tunes? Naturally I am looking for the most out of my car, but I am a business major, so wanna make sure the cost benefit is worth paying for 93 octane everytime i go to the pump.
Also, in the next month or two I am going to get a CAI since I can now use the tuner on it, and just wondering what your guys' opinion would be on the different CAI systems for sale... I have heard a lot of people for MAC and K&N, but am interested in what people have experienced with any brands. Thanks!