Rather than start a new topic, I'll continue this one. Everyone has responded about the Avon Roadrunner positively, but no mention of the other tires in the Avon "Classic" line, so how about the Speedmaster MkII / Safety Mileage MkII combo? Any thoughts, experience with these?
http://www.avonmoto.com/products/classic
I have run the "Classic" combo you mention. I got close to 13,000 miles from the set before the rear wore out, and they handled okay for what they are. Ribbed front tire tended to track lines in the pavement. I would not buy them again. Not concerned with a period correct appearance. No noticeable dry rotting or degradation of rubber over ~2 years service.
Next set I went with Avon AM26 Roadriders, and the improvement in handling was quite pronounced. I'm no handling expert, but the Roadriders felt more stable going into a turn, I suspect due to the more rounded profile of the modern rear tire. Good wet traction as well. They started to dry rot in the treads within 2 years of build date, but the rear was close to worn by the time I noticed this. My dad had the same problem with a rear RoadRider. Nice handling/wearing tires, but the dry rot was concerning. Bike is stored indoors and no products used on tires to have caused this.
Running Metzeler LazerTecs now. Been happy with handling, but they haven't seen enough miles to comment on longevity. No dry rot so far. Heard good things about Dunlops, but never had a set myself.