Well there's allways Rolemaster, gotta love them charts 
seriously though, the AD&D system is hideously imbalanced (non wizes suck horribly once you get to mid-levels unless you load them down with heaps of magic items) and not all that good for strategy (especially for the non-wizes)...

seriously though, the AD&D system is hideously imbalanced (non wizes suck horribly once you get to mid-levels unless you load them down with heaps of magic items) and not all that good for strategy (especially for the non-wizes)...
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) 
This game uses percentile dice instead of the usual D6's, giving better accuracy in combat and use of skills.
The system isn't as good when scaled down as characters become too tough.
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