point buy
I hope this is the right stuff :
All abilities start at 8.
For each new ability score (9, 10, 11, 12, 13, 14, 15, 16, 17, 18) the costs in points are (1, 2, 3, 4, 5, 6, 8, 10, 13, 16) correspondingly.
25 points are standard, or 15 for low-power, 22 for challenging, 28 for tougher, and 32 for high-power.
That's from the DMG 3.5
I had some spare time as well.
hth.
