HTC SENSATION - SIM FREE SWAP OR SELL ?

Ideally I would like to swap this for a iPhone 4 or 4s or any high spec phones (BB 9900 etc) This is a great phone nothing else to be said just an apple fan. Phone comes with charger and headphone + 8GB sd card if I can find . Sensible offers this is a high spec phone as you phone users know. No international scammers or time wasters