The two treks are likely excellent. The Peugeot could be any number of models-- "record du monde" is on all seven of my Pugs, from the race worthy PX10s to the lowly (yet fine) UO8. It likely has French threading issues, and though they're easy to deal with if you do your own wrenching, I'd steer clear. Unless it has half chromed rear stays, then it's perhaps the best bike of the batch, and if you think you can deal with Frenchness, grab it. The Centurion Lemans was pretty long lived, I've seen them from gas pipe to Tange 2, so look for a tubing sticker. I believe the Raleighs are low end, some of which are nice, but it really depends on vintage on those. Don't know enough about Bianchis to make an informed judgement there; I'd need to see the bikes.

I would personally go with the Treks (unseen. Actually seeing the bikes might change my mind). Both those models should be lugged steel, the 610 Reynolds 531 in the 3 main tubes, and the 560 Reynolds 501, if memory serves.