sony ericsson experia arc for sale or swap for samsung galaxy s2 ?

this is the midnight blue experia arc in the box in brilliant condition it comes with the box all accessories which are unopened. the battery life is brilliant only needing charging every couple of days there are only slight wear marks on the corner which you wouldnt notice if you didnt know they are there, the phone is open to all networks and updates and downloads very quickly. looking to swap for a samsung galaxy s2 or sell have only had the phone for 2months, for any other info or questions please feel free to ask