transmission fluid - Extra-S 3.7 qts. so you need to get 4 qts.
differ fluid - Extra-S OR any other GL-5 75w90 gear oil, ex. Redline, mobil, Amsoil. You need apprx. 1 quart
coolant - Genuine subaru coolant + the additive (subaru coolant conditioner). You need 1 gallon of coolant + 1 gallon of distilled water. Stock radiator capacity is 7.7 liters, roughly 2 gallons 50/50 mix coolant/water.
Power steering - subaru's use ATF fluid. Its the automatic transmission fluid, get one quart of Subaru ATF, I get this at local dealer, around 6-7$ per quart.
These are the fluids that I use when I do my maintanance. Oem fluids. Use these that I mentioned or whatever suits you.