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Sorry, i haven't got time to go through all your questions. But personally i cannot see any reason to pay $200 more for the SU9600.
Your best bet for researching laptops, instead of trying to undertand all the little tiny bits of info and all is to read lots and lots and lots of reviews!
BTW neither of teh CPUS will be GREAT for gaming, but may just about sufffice, the important thing is the Graphics... it all depends what games and what els eoyu going to be doing.