I generally use single-scroll optical mice, and almost always ps/2. USB's are great, but they can flake on your when you're in the middle of something. I think they're all pretty much the cheap Logitech mice, some old Microsoft models, and a couple of AOpens. They're all about the same really. the ones that aren't optical need to be cleaned here and there, but I generally don't have to replace them.
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