What you need to do is is look up the value of the motor, add that to the package price, then look up the value of the 25 and deduct it from the total. That'll get you close.
I'm not up on tracker values, but I'd say that sounds fair, but not a steal assuming it's rigged pretty well. Might even be a little on the high side. I'm assuming this is a bass hull mod V rather than a deep V. If it's a deep V, disregard my comments. I've got no idea on those. Also keep in mind, 2004 sounds new, but is actually already 4 years old and very shortly will be 5 model years old. Some 09s are already out.
Before I'd commit to it, I'd do a good search on the internet to see what similarly equipped boats are going for.
Wannabe...