Mitch: I've been associated with Coldwell Banker for more than 20 years. I know from personal experiences when showing property to clients what rental agency has that certain home on their rental program... some good, some not so... I would reccomend "Discover Sunriver as #1, Sunray #2 and there are other good ones but I think you want the best.
Sorry for such a delay on a response on your question. Are you still seeking advice on this. I am an investor/agent in Sunriver and have owned many properties which we have rented through prop. management as well as on own. Please let me know if you seek additional info. firstname.lastname@example.org