I was back in Scotland over the weekend and I took my stepfather's old Peugeot CroMo road bike out for a spin around the local countryside. I don't think it had seen the road for the best part of 10-15 years (it still has the original Michelin gumwalls on), but after a clean and a good oiling it turned out to be great fun to ride and it chewed up climbs with ease.
Anyways, that bike will probably going to end up down in London with me when I get a chance to package it up sometime - but in meantime it's reinforced my need/greed for a decent vintage road bike to bomb about on once in a while. Preferably steel frame. Aside from general condition - checking for rust and the like - what are the things to look out for when buying an older bike? Also, apart from the top end models (I can't afford a Colnago Master, more's the pity) what brands are worth a look? Obviously bikes by the master frame builders can go for quite a bit, so I'd probably be looking for one that was a bit more mass market.
Just as a bonus - what old bike would you like to get your hands on if money was no object?