i'd try terwilliger once at least
i'd second brock on giving terwilliger a try. it is hilly, but it's a ride so pleasant people do it for fun. just stay on it until it ends, take a right and stay on that until you're headed downtown on sixth. but going through the highway mess at sixth and arthur really isn't that great either -- it's where i've had my only serious accident, the red light lasts forever, and you end up with a bike lane dead-ending and dumping you in traffic downtown. it still sounds safer than your route, but my impression is that you're willing to trade some security for speed.