http://maps.google.com/maps/ms?ie=UT...dc2ff5c6302822
This is the route that I would take. My commute is from 170th to Downtown Tigard. This route is nice when there is little to no sun light and when the weather is nasty. I think that weaving your way to Baseline road would be the best. Then from Baseline its a straight shot to Hillsboro.