I'd go with DeWalt. They have a fine line of power tools. The cordless 14.4 drill I have now has lasted over 3 years and I've never had a problem with it. DeWalt also has that cool radio that charges batteries while it's plugged in. That unto itself is a great feature. My hand tools are all Klein. No sense wasting money on junky tools if being an electrician is your primary source of income.
