LHM in Sandy has been excellent to me. I didn't buy my STI there, but they have been the only ones to work on it, because Mark Miller gave me the run around.
When I first bought my car it had problems...
3rd and 4th Gear both needed replaced, the rear struts were shot, all of the synchro sets in the tranny were garbage...my rear endlinks were bent.
They took it in, and although they didn't have all of the parts in stock they got them ordered and installed fairly quickly. They didn't even question that it was warranty work...even though it was probably from the previous owner beating the car to hell.
They even replaced my Brake Pads while it was in there.
They gave me a rental car from enterprise which is next door to the dealership...They even gave me a Jeep as a rental, which made the Deer Hunt that much better.
I have only good to speak of them, and will return if I ever have a problem.
I have not dealt with any of the dealerships around here to find out which ones are MOD Friendly...but when the time comes I would try them first. My '04 STI was stock when I had the work done...but it isn't now.