I have always lusted after a Peugeot PX10 and recently had an opportunity to pick up a 1972 frame for a pretty reasonable price. As purchased, it includes the original seat post (but, sadly, not the original Brooks Pro saddle), headset, handlebars and stem, Mafac Racer brakes and levers, Stronglight 93 Crankset, Stronglight BB, original peddles (but, alas, not the original Christophe cage and straps) and a crappy Suntour front derailleur. My first thinking was to start shopping for the original Simplex Prestige front and rear deraileurs, a period-accurate wheel set, and a decent pair of clinchers. However, I'm starting to think about going with a more modern (translation: "more dependable, more smooth, more metal") derailleur kit and possibly even a more contemporary light weight wheel set. Haven't measured the rear to see how many gears I could fit if I did, but I can always use a five gear freewheel, I suppose. What would be the arguments against this approach? I wonder if there'd be any problem fitting a Shimano rear derailleur onto this frame? I'm just thinking at this point, but I'd appreciate feedback.