I just sold MY04 350+ HP STI on autortrader.com... the key is lots of pictures. I used my ISP as the host for the pictures and provided a link in the add. I only got three callers, I sold it for 2k above trade in... now I'm getting a NAV system.
Since I had cash I was able to negotiate effectively and got 500 off MSRP + spash guards at cost.
I drove it home today for the first time and was averaging 39 MPG, according to the computer.

The dealer is about 50 miles from my house.
Oh ya I also got 1/4% off my loan cuz i bought a hybrid through my credit union... 4.45.