|Douglas Muir 406|
Everybody argues about builds, but with 20 points I'd suggest:
Str 8 <- because at low levels 7 Str means you can't carry your own backpack
Int 15 <- add +2 for human =17, level 4 boost to 18.
This is rather MADdy for a wizard character, but Diabolists are kind of MADdy -- you need a good Cha score. Also, you'll have a perfectly okay 18 Int at 4th level. Getting a better Int modifier requires Int 20, which means putting 13 BP into Int. Cha needs at least 5 BP, so that would leave you just 2 BP for everything else. Doesn't seem worth it to me -- especially with a build that will do a lot of summoning. (Because summoning spells don't care about your Int. No spell DCs!) Take your 8th level bump on Cha, because you'll need it and also because it's cool... how often do you play a wizard with 16 Cha?
Again, I'm sure other people will disagree -- that's the nature of these things -- but that would be my suggestion.