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The upper engine mount was known to have problems, causign vibrations such as you describe. Saturn has released an updated design upper engine mount and studs to correct this condition; the lower mounts rarely fail. These cars had a vibration problem with the upper engine mount when they were new, so the upper mount may look like new but still be the source of the problem.
If you contact your local Saturn dealer parts department, I am sure they can assist you in determining whether your car is in need of the updated design engine mount. Also, ask them for a copy of Saturn TSB #01-T-30A which details the modification procedure to eliminate the vibrations you are experiencing.