I'd consider a second bike if you have the room. By the time you have bought a rigid fork and tyres you might be into the best part of £100. Somewhere is offering a *new* kona smoke hybrid at £200 (rrp330) right now, this is a vastly better bike for commuting. If yu try the great second hand adventure, you might get an even better deal. It helps to be handy with the spanners though, you can easily buy something someone else has failed to repair and have hours of fun sorting that out.