You should be very happy with your 560 - it is a truly terrific bike, with a Reynolds 531 frame and Shimano 600 components. All good stuff.

There is not a whole lot you can do to lighten it much - (assuming you don't want to install a carbon death fork or sinking a fortune into a wheel set) - and anyway it would not make much difference in performance. The rider is the main component in achieving optimal performance, and if you ride long and often that will improve. (Of course your showroom bike will start to show a little wear).

You should check out the Trek catalog as m750rider suggested.
For pricing there is another forum you can visit. (We're not supposed to do appraising in this one)