Depending on what you were going to use it for, I would go with the LM Wave or Pulse.
These are great "everyday" type multi-tools.
If I were concerned about size/weight, I might consider the original PST, PSTII or the clip model. These are smaller and lighter but not as useful, IMO as the Wave. I like my Wave and carry it most. I do not have the Pulse, but consider it an improvced Wave.