for sale iphone 5 black/slate 16 gb amazing +

here i have for sale my iphone 5 black/slate 16gb model in amazing new condition ,only 3weeks old i have all extras in box earphones not even took out the plastic ,beat the waiting list still has warranty till sept 2013 , i am selling for 525 cash or will swap plus 200 for an iphone 4s in white must be in new condition not on contract i will check i dont want it to blocked. please get in touch thanks for looking