A Tubis rack http://www.thetouringstore.com/ is a very lightweight rack. The "Fly" weighs almost nothing and is not very noticeable on the bike. My Ortlieb panniers fit it well and just clip on and off one-handed http://www.ortliebusa.com/

I leave my rack on my Volpe. And as far as a Surly goes . . . I am in love with my Big DummY!!!!!