I worked for Aero Air a while back. Back then they kept their ambulence and charter dept separate. Good place to work, people were friendly. More turn over on the ambulence side. They fly turbo twin commanders and use two crew.
There's actually quite a bit of GA around PDX area, probably due to the tax benefits than other states. UAO, and MMV also had GA at them also. Just one of those places you want to make contacts and blanket the area with your resume. You never know what single jet operator is looking for.
I'm going to assume you're a captain with QX by your post. Why leave?