Question About Dark Roast Coffee

Yesterday, the lady tried to sell me Dark Roast at Second Cup. When I buy Starbucks Iced Coffee at Wal-Mart or Publix, sometimes Dark Roast is only available, and usually, it's unsweetened. As I have been cutting back on sugar intake, do we have any recommendations besides Agave or Simple Sugar for making Dark Roast coffee drinks taste not so bitter?