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well well... try it out I'd say.

Get Fraps (demo/limited version) and you're going to see the FPS in one of your corners.
There's usually a button in every game that analyzes your specs and automatically selects the "best" ones. Though you'd still be better off doing it manually once you know what you're doing.

V-Sync is only really helpful if your FPS jumps too often. I'd say disable it and only enable it If you notice screen tearing.