Hey man, I had the same thing happen to my 2000. It had an air-leak that I didn't know about and it fried my motor. Costs on the top-end were 850 bucks.
Including Wiseco pistons (forged aluminum), P-2 bore, doming the heads, and I thnk that is it.
See if e-bay has some new pistins for what size bore u want, (if u want to bore it.)
umm, that's the cheapest. Vito's pistons are heavy, they like to shake the engine real bad. Harder on the engine mounts.
But if your heads, arent thrashed up, your price wont be that high.
I lost my compression, i could push it with my broken wrist. (Which u cannot do on a new top-end at all).
U can do most of the work yourself, by taking the jugs off and taking them to the mechanic, and taking your pistons off, blah blah blah. It would be a hell of a lot cheaper then too. It's real easy and not that hard. Especially if u buy a Banshee book. Since banshee's have been around since '86, and nothing has really changed. They are almost all the same. Not a bad project to do. And in-case u do screw up, there is always somebody (mechanic) that knows how to do it.
Have fun man, and good luck......~Ryan