I'm not saying it can't happen. I've seen Barrett Jackson sell a silver 04 for $57,000. Is it realistic? No. Possible? Absolutely, anything is possible.
Everyone keeps on saying "well I've seen this.." or "I saw this once!"...we aren't talking about extreme highs or extreme lows. YES, you may find someone in the middle of a divorce, losing his business, and going into foreclosure willing to sell his 03 for $30k. Or you may find someone who has a 0 mile, never sat in, still in the wrapper, 03 that someone HAS to have that sells for $60k.
The OP here is asking what a reasonable price to sell his gen 3 at is. Not the lowest or highest you've ever seen one sell for.
A realistic price for a common color, but clean 03/04 would be mid 30's to low 40's. Where in that range depends on how quick you want it gone.