Older Peugeots, which are the best?

i had a carbolite pug (still do but it's a bit knackered). it was actually a very nice ride and not that heavy. thing is, you don't really want to throw too much money or quality parts at one. so if you're looking to convert and you don't already have bits lying around, you might be better to look around for a reasonably priced 531 frame.

things to look for:

plastic spoke protectors, suicide levers, lugless - indicate carbolite or worse tubing, low-end bikes.
flick the tube and see if it pings/resonates - 531 will.
this site is good for identifying:

http://www.peugeotshow.com/

mate, that's a great link! ta for that, they got some gems amongst them!