Really depends on your school, for example my friend has a GPA of 4.75/5.0 and 3.75/4.0, yet he is RANKED 15/800 in our class. I ****ed up my freshmen year and resulted in a gpa of 4.3/5.0 and 3.7/4.0 and got a class rank of 150/800. I'm bringing it up though, i'm owning it up in ap world history where as most people are making B- and C's, so i'll be in the top 10% by the end of the semester.
4.0 for someone who has extremely weak EC's and has no life
I think a GPA of 3.9+ is great for someone who doesn't have much a personality, whom joins a tons of clubs, drinks every ounce of ivy league admission kool-aid advice people spurt out, volunteers at places he has no interest in and does little to stand out,
3.8 for people who have great EC's.
3.75 for highly competitive athletes that stand out in admissions