Calling all Affinity experts!

  I recently completed my modern Affinity deck and have been loving it so far. Next week my LGS is holding a modern GPT and I would love to walk out with a box of MM15!
  So far I have deduced that my meta consists of: Grixis Twin, Jund, Burn, Soul Sisters, Storm, Delver, Affinity, Elves, Amulet Bloom, Ad Naseum, Bogles, and Grixis Control.
  Basically I'm looking for both mainboard and especially sideboard advice taking into consideration my meta. Also: suggestions on what to bring in/take out for each match up. Thanks in advance everyone!