Velo-orange do 126mm freehubs. The decision you have to make is how original do you want to keep the bike and when to make the leap to more modern components as there is usually a knock on effect. ie 10 speed hub needs new derailleur or new shifters etc.
FYI
Sun 27" CR-18 Rims on Sealed Hubs QR Wheelset Freewheel - Harris Cyclery bicycle shop - West Newton, Massachusetts