I was feeling poor when a Limongi languished on ebay a few years ago, it looked like it would have ridden like my LeJeune which I like very much and was my size. It sold for $175. plus shipping. A Deal.
I don't know about world's greatest, but a decent builder, I will be motivated to purchase another if the chance arises. France has produced a few who do the all the crafting of the frame with their name on it. Unfortunately often they also ended up making bikes for professionals who must have "the team brand" color and graphics applied.