I know I'm going to get all sort of responses, but I'm currently thinking of going to 25mm tyres after a number of people have told me the advantages of the lower rolling resistance. What I'm wondering is would you use them for both racing and training? And I guess does rider weight (64kg) make a difference to tyre choice?
Also what would be the clincher of choice? In an ideal world I'd opt for an open tubular type for best, and a cheaper training tyre, but I'm not sure this is an option at the moment.