Hi mate, welcome to the club
As a rough guide - The bugeye is the shape from 2000 to 2003, blobeye is 2003 to 2006, hawkeye is 2006 to 2008.
In the wagon range, there are a couple of non turbo models to choose from, but only one turbo model, the WRX.
You should be able to pick up a 2003/4 blob wrx for your budget.
Don't worry too much about mileage, just check the history and give it a good once over and test drive. mine has 110k on the clock and is running 330 bhp.