I need a winter project and have been thinking about trying fixed. I have been offered a Cannondale track frame for £70 (incl. front wheel, forks, seat post and cranks) - is this an acceptable price? - and also, is a track frame on the road a good idea, or is it going to be too harsh/twitchy/uncompromising? I don't intend to do big miles on it, just local rides on dry days.