What you've now got as a default works, but that also means that when you don't want Sparkle Text, it is something you have to delete. that's clumsy.
You can have many different templates. You can even have your own specialized templates in a folder named what you want. For example, when I was working, I created a template called "For Work" and placed all those related templates there. Then, when I opened the Templates folders, I'd see tabs like "Spreadsheets" "Presentations" "For Work" etc.
What is interesting is that by creating a personalized folder for templates does not, alone, make that folder appear on the tabs. It won't appear until you have at least one template, or file, in there.
Last point, the template structure and selection is now different with Word 2007. So I am not sure if what I just stated above is meaningful still. I have not checked it out, yet.