Good alternate to cross Oregon?

[James]

I am planning on doing Seattle to Portland ride this year, and would like to take an extra week or so and also ride home (Boise ID).  Just was hoping to get some feedback on alternate routes.  I have rode the ACA route through John Day so would like to do something different.  Is highway 58 from Eugene to Oakridge a good ride?  Also has anyone rode highway 380 from Prineville to Paulina and points west? if so how was it?

The rest I think I have figured out.  Any help would be much appreciated.

Thanks
James