I actually have a 40 point system I used for my current campaign.
Now I know that'll elicit gaps of horro and cries of munchkinism, but consider the following:
1) I'm a tough DM most of the time. I throw tough challenges at them. The campaign is not going to be a gentle one, and they'll need to be tought to survive it.
2) In this case, I did want the PC's to be 'special', and clearly a cut above even normal adventurers. The campaign has the possibility to become a truly world-shaking event.
3) These are excellent roleplayers I'm working with. Since I run an online game, I've vetted who takes part carefully. When I first proposed running the game on
www.roleplayinggames.net, before I'd even put it up on the list of games looking for players, several people who I knew to be excellent rp's from past experience already showed an interest. I feel I am lucky enough to have a kind of rp'ing 'dream team', who can be relied on to not dive into the realms of munchkinism at the expense of rp'ing. I do indeed want characters that have been thought over to make them fairly powerful, but I can be happy in the knowledge that none of these players will decide to overly power-game at the expense of the role-playing and story aspect of the game.
So 40 points does me well.
Edit: Oh, and note that there are 8 PC's IMC, and even despite high scores they're
still going to need each other and make use of each others strengths and weaknesses.