I have been doing some before/after and am working on a "Rat Fink" using a really trashed old chrome Voyageur 11.8 frame. What do you guys use for rear derailleurs to upgrade on old 10 and 12 speeds? Friction is ok and preferred. The Fink will have a cruiser seat, close to flat bars up front, green flame decals with green cable housings and a flaming eyeball bike antenna topper as a bike flag. Dice for the valve stems or Maltese crosses. Hey, its cheaper than doing a hot rod car so don't laugh!