I'm trying to decide which bike to build up and I can't decide between using my early 70's blue Peugeot U08 frame or the same period PR10 frame. Both are in excellent shape, but as some of you know, the PR10 has Reynolds 531 in the 3 main tubes and the U08 is all just plain tubing. My question to you is this: When taking into account the weight and performance factor in the better PR10 frame, is it worth using over the U08, which is beautiful blue, that I wold prefer to use aesthetically, or should I just build the PR10 (the finish on this one is pretty sick too, white and black you know?) I won't ever have both frames parted out together, so I can't just compare their weights by hand. Any suggestions?