The biggest problem with cordless drills these days is that they have all gone to T-handle design, instead of pistol grip. For jobs like drilling with small drill bits, & running drywall screws, you want your hand in line with the bit/screw. That's why all drywall guns are pistol grip!
It seems to me that the hot set up would be a pistol grip dw gun with a brushless motor, & a belt clip battery pack with a 4' to 5' cord. The gun weight would be minimal, brushless have plenty of hp, the belt clip battery pack would have a crazy big Mah rating, & wouldn't not be resricted to dragging a cord around room to room.
Interesting thing is, B&D used something similar to this (belt clip pack) in their original cordless drill setups. Today, I can't even find any referance to them.
Joe