What is your spending limit?
Would a New WRX or Forester XT be options? I have seen new WRX's as low as 19,000 and XT as low as 23,900. I owned a Forester XT and it was by far the best vehicle I have owned. Even better than my 03 WRX. With the current economy, I would wait a bit. The deals will only get better. Subaru is one of the few car companies that did not suffer as Toyota, GM, Ford, Dodge.....
You own a Subaru so you know how reliable they are. Consumer Reports rated Honda, Toyota and Subaru as the most reliable cars by FAR. On the other hand, buying a used sports car is iffy.
Take a good look at the paint and interior. It will give you a good idea on how the previous owner took care of the vehicle.