Moved some bits over from my pump track bike which I can't use at the moment, to a £50 frame I got on eBay, to build something cheap and utilitarian but nice to ride.
Frame is 1650g(!) and the whole thing is around 11kg at the moment. Quite happy with the £70 8 speed Microshift drivetrain.
Planning to get some thinner, slightly lighter tyres (as nice as cornering on 2.3" semi-slicks is) and some more swept bars, to make it more suited to longer distances.