Hey Marc,
I am in a similar situation. In the market for a Mooney (M20R in my case) and flying out of KTTD regularly.
You can check out https://www.themooneyflyer.com/cfi.html and scroll down to the Oregon and Washington list. There are 3 guys on there (Portland, Hillsboro and Kelso based). I don't have my Mooney nailed down yet and I have not contacted them to schedule so I can't vouch for any one in particular.
Good luck! Let me know when your purchase is complete and you find an instructor. Would love to see your new Mooney.
Michael Menzies