I can't recommend an agent, but I do have a copy of the Sunshine Coast property paper that comes out every week (I was up there a couple of weeks ago). If that would be any help, email me on firstname.lastname@example.org and I can send it to you.
Buderim is gorgeous and seems to be growing. I plan to look there for an investment property soon.Great place.
I'm a property manager on the Sunshine Coast and know Buderim fairly well. The market is still booming here to the extent that most REA have waitlists of buyers. I would find it difficult to recommend one particular REA. You can contact the Sunshine Coast Daily and have Saturday's paper delivered to you. Ph: 07 5430 8000
Good Luck! Ian