The 5000 is Aluminium Altec tubing, and was ridden by Veronque in the TDF,whereas the 200 was Steel - at the time the 5000 was more expensive, but i would have thought the 2000 is worth more now as the Genius is more sort after.
It is also worth noting that there are 2 specs of 2000 - yours is the 2000G the with Genius, and the cheaper 2000b with Columbus Brain - that is the bike i thought you had
The tubing on these bikes is beautiful though - here is a link to the original catalog - i have amended my previous comment
Thanks for sharing your knowledge about these Peugeot bikes. I've added the catalogues to my archive.