Best photo archiving and/or cataloging software? (more inside)

I was using iview media pro which was working well. When they upgraded, they changed to Expression Media 2. I tried the trial version, and it was pretty much the same as iview. However, when I went to purchase a key online, I couldn’t find the cataloging software on the site. I only found web building software, among others. So, I am now in search of the best archiving and/or cataloging software for Mac. This is for a business, I am a photographer, and need to be able to recover images from years past with tagging words, by people’s names, etc. Can anyone suggest anything? Thanks