The product from www.AirVent.com is called TheEdge Intake Vent and another alternative which I have personal experience with is called Smart Vent from DCI Products Inc., @ http://www.dciproducts.com/html/smartvent.htmThe rafters are 2X6. Due to cost, we are reconsidering asphalt shingles.
We would also intend to remove the attic fan and install a ridge vent since as you said, yes we are venting on the wrong side as of right now!!!
There is an option for this "air vent" thing which puts these intakes at the edges of the roof and that matches up with a Ridge vent. If we take the insulation down and put in the baffles (whatever it is calld that keeps insulation from being pushed up against the plywood under the roof) and spray foam on top that would be the way to get the most dense possible in a 2X6, probably.
Previous owners put R-11 in there now and R-11 is really not enough I don't think(?).