Check out CadCode, http://www.cadcode.com. It will do nesting and can import excel files as .csv's. By using either a template, or macros, you should be able to do what you want. This depends on the parts you are making.
I think it's sold in seperate modules, but it should be a bit less than AlphaCAM. They don't have a lot of info on their website, though. You may want to call their Australian dealer and have him give you a demo.