I designed my system to have hit points based strictly on Constitution (No levels or classes in my RPG system). Nearly unchanging hit points works well for the feel of "growing skills but still human".
Of course, that makes my system quite deadly - Though my tweak of defenses means a combat is more "swingy". I RP it like a great duel (I wanted that feel - Like the old style swordfights in movies - especially Errol Flynn/Basil Rathbone movies).
Hope all these ideas help you out...
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Smoss
Doulairen (Doulairen)
Or go directly to some details on my RPG system:
RPG System (Doulairen)
Of course, that makes my system quite deadly - Though my tweak of defenses means a combat is more "swingy". I RP it like a great duel (I wanted that feel - Like the old style swordfights in movies - especially Errol Flynn/Basil Rathbone movies).
Hope all these ideas help you out...

--------------------
Smoss
Doulairen (Doulairen)
Or go directly to some details on my RPG system:
RPG System (Doulairen)