iphone 4s 32gb in white on o2 swap samsung s3 or HTC one x ?

right iv had iphones for around the last 4 years and im looking for a change and i really fancy a decent andriod phone so im looking to swap or sell my iphone for a samsung s3 or htc one x both of these phone i would want to be the white version.. my iphone has never been out the house without its rubber case and has never been used without a screen protector and as a result is like new.. i have had the phone since the day they came out (as with all my other phones 3g, 3gs and 4) and its been great still have the box etc but i am missing the headphone as i have a light fingered little brother 07701020434