Samsung Galaxy S2 - 2 months old - factory unlocked - swap for iPhone 4S or iPhone 4 ?

I am looking to swap my Samsung Galaxy S2 which is 2 months old and has no scratches or scuffs, for an iPhone 4S or iPhone 4. I used to have an iPhone and just miss it. I cannot find fault anywhere with this phone, just want an iPhone again. So if you are looking to swap your iPhone for a phone that is just as good, then please send me a message =) Thanks!