Just what level of accuracy are you looking for?
You could pick up a .308 bolt action sporter in a variety of manufactures that would shoot ~ 1 MOA and cost around $500.
If you could find a fresh .308 660 takeoff, many smith's would probably screw it on for a reasonable price, getting you comperable accuracy. However, your chances of finding that barrel are quite slim.
You could have it simply rebarreled with a custom tube, without a full blueprint, and probably hope to shade 1/2 MOA, provided the rest of the platform is sound. Should be able to do this for $350 - $450, and many smiths could handle the work.
Lastly, you could have one of the smiths which frequent the board (or a number of other accuracy minded shops) true the action and install a topflight tube. Most will guarantee 1/2 MOA, and often deliver better. This would cost a bit more than a basic rebarrel, and could involve a wait, depending on your smith of choice (smith's develop a waiting list for a reason, hint).
If ~ 1 MOA accuracy is enough for you, a new gun is going to be the cheapest route, especially if you sell yours to fund it.