where can I buy an ipone4s iphone4s, processor, ipone4s, internet

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i would like to to buy iphone4s, but do not know how the differences compared to the iphone 4s and iphone 4, performance, sound quality.
which processor is better there is no perfect escape, there is no wireless internet functions. used as birthday gifts are fit.
i want to buy iphone 4, just do not know what a good brand, the money is not a problem.
i iphone4s how much? i want to give my wife to buy. with the girls do not know the good, not powerful. are there any other color in addition to white and black.