Lots of good advice here. Personally I think the used 585 route is a no brainer. I hope to pick up one myself someday. I rent carbon bikes when I go on trips sometimes. Have had great rides on specialized and treks.. nothing too exotic, but great light stiff nice handling bikes that were fun to try out.
Fwiw, steel can be very light too these days. My s3 Waterford is 16.1 pounds and I wasn't even really trying to cut weight. With a red group it could easily get to 15.
Let's us know how it goes when you figure it out.
