It really all depends what you want to do. I have CS2 and Elements 4 as well. I also have a programmed called Acdsee. Each of them run the gamut of capabilities, but I like having the flexibility between the programs. For example, Acdsee loads quick and lets my browse photos quicker than CS2 (Adobe Bridge) and Elements. However, when I'm editing hardcore, it's in CS2. I only use elements when I want to make an interactive photo disk with music and stuff as it's easy to use, but also has some of the cool functionality that CS2 has.
Each are obtainable if you're a binary newsgroup fan. 