The next step in the Small Business Server 2011 configuration is to start putting system-related details into the wizard. The server name and domain name values are very important, as they cannot be changed after the installation is finished. This inconvenient requirement puts the decision process on the administrator for a relevant nomenclature.
My recommendation is to make the both of these names generic. Should virtual machines be in use, consider using this blog post as a framework for virtual machine nomenclature.