Swap my new Galaxy Ace for used Galaxy s i9000 !

Hi I am looking to Swap my new Galaxy Ace for a used Galaxy s i9000. I bought the Ace to replace my old galaxy s which developed a fault with the screen. Although the ace is a great and phone and very light I think I just prefer the S i9000 as Ive had one for such a long time ! Alternatively willing to sell the Ace for 115. Unlocked in brand new condition. Cheers Sid.