Personally I would think that it would value at the same. EoC won't change much for the value of your account because nothing in the game is really changing related to turmoil. I understand that EoC will be a huge update, but I honestly believe it won't affect the value of accounts until it's been out a while. If you're happy with the current offer, and think it's enough to accept, I would just tell you to accept it.
Best of luck with your account, and sales.