I would imagine you would be lucky to be offered $14,500 on a trade. I just sold my 2000 RS for $17,500. It was still a money loser as this was a nice car loaded with factory leather and only 7400 miles. It was still better than a trade though as I think I probably would have only been offered 13-14k as a trade.
You still have time before the WRX arrives to sell your car. I would definitely put a little effort into this mainly since you are in Colorado and it should be fairly easy to sell your car and get decent money. My advice: detail it real good and park it somewhere where a lot of people will see it. I sold mine in less than a week.