It's not often I do a post about theme providers that do themes for lots of different systems but this one was pointed out to me by someone and they wanted it, so I had to go get it and it's nice, so you're getting a link to it.
It's from TemplateMonster and it's called Joomloo and it was sort of built as a directory theme, but we're going to be using it for something different and we all know the capabilities of Joomla, so it could be used for pretty much anything.
The thing you're going to like about it is the design. It's simple and clean and fast loading. It comes with the source files so you can change it around a bit and it uses all of the core functionality, so as long as you're looking for a clean install, you're going to be very happy.