Remember you pay for what you get.
Its not wise to pay to much and get too little,
But its not wise to pay too little, and expect too much.

For tuning, try:

Race Torque Engineering
Maximum Motorsport.
AllStar Garage

There was an Outback for sale in WA earlier this year, and it had an STI engine swap. It was sent over from NSW, and it struggled to get registered here due to the engine and driveline swap. Does yours have WA rego? And further (I don't expect you to know this off the top of your head, most people wouldn't), if it does have WA rego, does the rego match the VIN?