DRS,
although not essential (from what I read, only), it'd be more competitive having 5 hours or so on it, I'd say.
Portland area doesn't sound 800km away from Silverton.
Just a thought. It's in their charter department (obviously not used as big C152 or C172) but I'd give them a call for quote. Easy.
The only 206 I can find within 800km is USD 300 / hour plus USD 50 for the instructor
What about Hillsboro Aviation and C206H?