For household use, what should I look for when I am shopping for Drilling machine?

I am shopping for a cord (or cordless) Drill/Driver. What should I use to consider the right equipment for household use?
(1) How much voltage should I be considering?
(2) How much wattage?
(3) How much rpm ?
(4) Other advice?
(5) I am considering Skil and DeWalt, do you recommend one over another?
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