Donna, as Sami mentioned, I use XWD6 and recommend it as a replacement for CSB. It is very much like a modern version of CSB, but much more versatile and easier to use.
Rather than copy your existing site, my suggestion (assuming you have time), would be to create a new site with XWD. You can have a smart, modern and crisp-looking website, while at the same time, retaining the look and feel, colour scheme, etc, of your existing site. Kind of like a make-over!
I think once you have played with XWD for a while, you will be impressed with what you can do with it, so easily. We are here to help if you get stuck on anything, and also there is a very good forum dedicated to Xara products.
Rick