Hal,
I think your money's best on the Mirage. Think of it this way - the Mirage is in the same price class as Zytel handled folders (e.g. Spyderco Endura, Cold Steel Voyagers, et. al.) Though the Mirage has Zytel scales, it is a sturdy linerlock® knife with steel liners and microscrew construction. But I don't know how the AUS-6 steel of the Mirage will hold up to, say, Spydie's ATS-55 which is used on the Endura. ATS-55 will probably outperform since it's very similar to ATS-34 in performance. In closing, the Mirage offers a much more solid feeling knife thanks to the steel liners, but then it weighs more than the Zytel models. Hope this info helps!