No (persistent) buffs increase Haste Rating, they increase Haste directly. And the 2005 assumes certain raid buffs are present providing some haste. To figure out your haste break points for the buffs you have in your raid, consult TreeCalcs. Specifically a 5% haste buff from Balance Druid, Shadow Priest, or Shaman totem.
You input your talents, buffs, stats and so on and it will let you know where your haste breakpoints are.