Alright, here's my suggestion on how to run stuff 'round here. I'd have to agree with Buzzard on the ability points thing.
I think that everyone should start out with 20 HP, 5 PP, and 3 AbP.
Each time you level up, you should get 2 AbP.
1 AP can be used to do any of these fine things: +5 HP, +2 PP, +1 AP, +1 DP, or an additional ability.
At any time, you can subtract 5 HP, 2 PP, 1 AP, 1 DP, or 1 ability to give you +1 AbP. However, your HP can't go below 5, your PP can't go below 0, your AP can't go below -5, and your DP can't go below -5. It'll be pretty much just like the old RP system, except without the ability list or weight system.