I came back to this thread to discover that it sounds as if there are no specific symptoms leading to the need for an overhaul. I would like to know more. Have you done a compression and/or a leakdown test? Does it have low oil pressure? Is it consuming a large volume of oil? Today's fuel injected engines of all makes are capable of many hundred thousand of miles when properly maintained and not driven abusively, especially if they primarily see freeway/highway use. If there is a symptom that warrants it, tear down, measurement/inspection and overhaul is the best way to go.

In this process you take care of the problem rather than paying for parts and machine work that are unnecessary. For example, if the crankshaft mic's out okay, tit isabsolutely not necessary to turn it. If the bores are only slightly worn, fresh rings are MUCH LESS expensive than boring to oversize and replacing Pistons. In fact you might be taking out much better Pistons than the Chinese junk you put back in.

One last thought. General Aviation, piston engine aircraft statistically have fewer catastrophic failures with very high time engines than the first few hundred hours after overhaul. The overhaul event just presents the possibility for things to go wrong. Aircraft engines have different specified Time Between Overhaul(TBO) reccomendation, depending on engine model. With Lycoming and Continental engines, there are many particular model engines that very commonly double TBO when properly monitored and maintained. Many variables play into engine life and it can vary widely.

Again, if it ain't broke, don't fix it.