i'd say 8000 is a superb score on 3dm06. there looooooooooooooots of people who score way lower than that.
if you are pulling 7K and over...you should have no problem running pretty much anything at higher settings.
12K? sheesh, i wouldnt lose any sleep over that.
i have only ever had trouble running flight simulator 10 and vegas so i run vegas on medium settings for now every other game i can run max no lagg, and i got a 3dmark score of 4000's