Upgrade my Bontrager race lite hard case 700/23?

Fatamorgana Posts: 257
edited April 2013 in Road buying advice
I'm looking to chop these out for a summer (!), quicker tyre.
Just 3x club runs a week, but a quicker tyre would be welcomed.
Not considered a summer tyre as new to road riding so any pointers or links most welcomed.
Or should I save my £ if it won't make much difference?