I may debate abandoning point buy if rolling for your stats did not produce very drastically different characters in terms of strength...something like:
03, 04, 05 = -2
06, 07, 08 = -1
09, 10, 11 = +0
12, 13, 14, 15 = +1
16, 17 = +2
18 = +3
(If I remember correctly, classes will add +1 to...