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I'd say, use Mozilla (available for OSX), get "latest stable version" (unless you enjoy "testing" a beta which will crash repeatedly) and set the preferences to no cache and so it doesn't save all your typed in urls and stuff. There's a way to do this in Moz -- my brother turned it off just because he found the feature annoying.
You could also click on the bug button and send a bug report to Apple complaining about the cache problem. They might allow you to change it in a subsequent version.