WTT: 2011 Cannondale Slice 5 sz 56 for your 58

Bought a 56 Cannondale Slice 5 and have only used it for about 60km and I am realizing I was mis-sized on a 56. I love the bike though and want another Slice in a 58. I would also look at a 58 P2 or Triad 58.

I am located in BC Canada but can make an exchange into Alberta or down to the US through Washington, Idaho, Oregon and maybe others....I can call it a vacation.