How much does the Raven Sport Tour weigh in its default configuration? (The Cycling+ review of the Raven Tour says that it weighs 13kg.)
I'm pretty sure I'm going to buy a Sport Tour for my 12 mile (each way) commute to work, but two things I have in favour of the Tour:
Longer chain stays - I don't want my heels clipping the panniers. (I want panniers, rather than a rack-top box, so that I can pick up a decent quantity of shopping on the way home.)
Greater off-road strength - although the roughest stuff I would take it on would be surfaces like ballast on disused railway tracks, and that unladen.
Cheers, James