Bar the great custom builders like Nagasawa, Toei and 3Rensho, you could do much worse than a (Koga)Miyata FullPro with Dura Ace. Saw one recently and it was the nicest production bike I ever saw. Clean, crips lugs, nice panto, great parts and a lustrous green/blue paintjob with an interesting fishscale effect. Great chrome too.