The only thing that looks at all interesting is the Scott, depending on how much it is.
The yellow rock shox Judy tells me that one is ooooold, not worth 225.
The Gary Fisher looks interesting, till you realize it's a single speed. The fork boot on the giant screams old bike as well, fork boots have been "out" for well over a decade so you know it's at least that old.
The problem with an "old" bike is the shock technology of the late 90's - early 2000's when those are likely from was garbage compared to today. At the very least they would need a rebuild, and even then would be kinda sucky.
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