Off the back of this thread, I've gone ahead and bought the 27" wheel. Now looking around for a tyre to run on it - the conti gator skin and sport ranges look ok, but I've heard a few bad things about their handling in the wet, and their puncturability.
Has anyone had any bad experiences running these tyres? I'd be really interested in finding out what anyone else runs on their 27"-ers, I'm still looking around for non-amber sidewalled tyres!