Go to CarMax, have it appraised. High trade in value!
Hints from a CarMax salesguy whom I bought the car from: DONT tell them you are going to trade it in. Just tell them to appraise it. Dont leave any ownership paperwork on the car if you decide to sell it after they give you the appraisal sheet. If you have a spare key's bring those with you too. Key is not to make the appraiser think you are going to trade it in to them. It's a simple process, just giving you a heads up as per information from a CarMax salesguy.
Here's one in your area:
Also check out KBB.com The 2004 xA/xB KBB Value information was released a month or so ago.