This subject has been hashed around many times in the past, and I'll offer the same JMHO that I always do. If you're not a DIYer, I would buy a new engine - one backed by a 1 year warranty. Since we all agree that the valves are randomly smashing into the top of the pistons, then there is no reason that the lower part of the engine can't be damaged along with the top. And the biggest problem with all of this is you will still pay the 2K, regardless if there is additional damage or not. So, for around another 1K you can at least be fairly sure that you'll have something that won't need another engine repair for a long time (if it has to be rebuilt well enough to last a year, then it typically will go much longer). You would of course also put on a new belt, tensioner, idler, and WP if they are not specified as new.