We used 35-point buy in the campaign in which we used point buy. Compared to the "rolled" stats of other groups I have played with in my area, 35-point buy characters are underpowered. I have found the "standard" array for 35-point buy characters to be 16, 15, 14, 13, 12, 10. I really wouldn't classify that as being "high-powered" or "epic." The "rolled" characters I have seen in the Kansas City area are closer to the 45-55 point buy range. The two other groups I have played with extensively that "rolled" their stats have found it perfectly normal for every PC to have at least one 18, one 17, and 12 being the lowest stat. And when I say normal, I mean "matter of course." I guess it's all a matter of taste, although that's too twinked out for me, personally.
Even if you honestly roll your 4d6-1, you will most likely get stats way above 25-point buy in my experience.