I also just spent a small fortune on oil, an oil filter, coolant, a flush kit, brake fluid, spark plugs and new wiper blades. Also ordered 4 liters of Motul Gear 300 trans oil online. Phew.

All I have left to get is Subaru diff fluid.
Well since you are changing your spark plugs you should throw in the Cobb SF Intake, and silicone elbow. Since you have to pull the battery, washer fluid bottle and the airbox to change the plugs