NewM20CPIC

This may upset some of you but not nearly as much as it does me.  I purchased my M20c last February.  Instead of just doing a pre-buy, I had the mechanic do a full annual, and with the exception to a few minor issues that he reported, he cleared the aircraft for purchase.   From day one he told me that the cht would be high on #4 but would likely burn and return to normal after leaning it and high RPM run up a few times.  Well, guess what?  Since owning the bird, I had to do a full top overhaul.  It turned a large amount of aluminum was discovered during the first oil change.  Sent the sample in for analysis and it turned out it was active damage occurring with each flight. The heads were rubbing against the cylinder walls of the number 2.  It was not the #4.  The number for did have an issue but it was only a bad probe and that was easily repaired.  Now, I wasn't happy the large unexpected expense but I thought I'd bite the bullet on that one and just keep it moving.  Well, not so fast buckeroo.......Just had the annual performed by a different mechanic since the first one and it turns out the landing gear has old corrosion.  This was missed by the mechanic during the pre-buy/annual.  That means the bird was not airworthy before or after the inspection by the first guy's pre-buy/annual.  I'm mostly venting and pondering my next move but I would like my aviators to weigh in.  Please share your thoughts.  Thanks.