In reply to dh73:
My favorite jacket is a cheap NYCRR half marathon race jacket, bright orange, pretty much a nylon shell.
I'm not too bothered about breathability, if you run, you sweat.
But it depends how long you are out for, for a 1-2 hour run a jacket that wets out isn't too much of an issue, but a long 6-8 hour mountain day is more of an issue.