Mac Leopard Install Iphoto From Tiger

According to the Apple website: And the Mac Box Set costs $169. By that I presumed that I'd need to get the Mac Box Set at $169 in order to get Snow Leopard, or will there be a Retail version of SL at the usual $129? According to this ZDNet article I'm exempt from the $29 upgrade pricing since my Intel Mac Mini is a 2006 version (since it had Tiger at the start). ...

well, I'm not sure about graphical 'oomph', I would just like some overall 'oomph'. As I continue to use my Mac I'm running into more and more problems with applications which I've never had before. ...