Good simple Clipboard manager I'm used to using Ditto on windows, and need something similar on my mac mini.  

Any Suggestions?
I think your best choice is :


Clipboard Evolved


But you can also use these softwares:


JumpCut (Free and open source)
Clipmenu (As Calavera said :"ClipMenu is nice because it's free")
Clyppan
CuteClip
PTHPasteboard