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If I wanted to take one of the starting 8's down to a 7, how many DMs would give me a benefit in return?
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Lanefan
I've been in and have given benefits to buy downs. You could buy down to a 3 if you really wanted to. 7 = 1; 6 = 2; 5 = 4; 4 = 6; 3 = 9 points in your normal point buy generation.
Other times maybe that low Dex was a product of extra tough skin giving a +1 Nat Armor bonus or something similar. Really the only limit is between you and the DM for figuring this stuff out.
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If you only use Players' Handbook when you create your character (customizing Monks with splat books is allowed), you can put 2 extra points on your abilities (no cost).
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I do like the idea of rewarding players for sticking to a Core only. 2 points in point buys doesn't mean a lot in the overall game, but it's little benefits like that, that the players will remember and enjoy about the game.
I guess it is your view and your GM's view on the subject, but if the characters are above average and the average is 10, then that should be their lowest stat. It's a house rule from my group, 4d6 minus lowest or 10 which ever is better.
Another good method have seen it used before as well.
Another Point Buy + Random generation method is one I've used before and acutally use regularly now when I DM.
Points + dice
This is mainly when you want a more high power game though.
The concept is simply pick a point buy as a starting point.
Say 25, than roll dice of choice and add that to the point buy total and than buy your scores.
One of the best I've found that players like for higher power games is 30 plus 2d6.
Combine that with something like allowing a buy of one score higher than 18 base, you can come up with quite a few combinations.
But the main point of it all is, the method that allows your group to enjoy itself without worry is the best one of all.