That 's bad - total rebuild as Jim described.
No where I have lived is a 2006 250X in "premium" condition selling for $1500. But I do have to agree that it's time to decide if it's worth the rebuild cost over parting out. Parting out takes time and dealing with the normal BS of selling things. Ebay ect...
No bike with an engine like that could ever be considered in premium condition. MY definition is a bike on it's first top end, and ridden a few hours. That engine grenaded. The drive train is 90% of the value of a dirt bike. It can be repaired, but will always have an asterisk associated with it. Having tried to repair things for emotional reasons before, I realize the danger of going too far down that path, when cutting your losses and starting over may be cheaper.