mike1 
I think i would recommend buying new if you're buying cordless. I've been buying DeWalt for the last 15 - 20 years. The quality is good but i've found that the tool tends to wear out just about the same time that the batteries wear out.
You could buy new batteries and keep the tool running but you're just as well off to buy the whole works new. The cost is about the same when you catch the cordless tools on sale.
It's kinda like most of the value is in the batteries. The tool is mostly worthless when the batteries die.
I've been using an 18volt Dewalt for electronics breakdowns. It's great for a lot of other jobs but it's a bit bulky & overpowered for that particular purpose. You'd be better off with something smaller,lighter, and easier to handle if you were buying a cordless drill just for that particular purpose.
JMHO / YMMV
Edited to add: You are probably better off not to consider warranties when buying a tool. It seems that the vast majority of manufacturers talk a good game but won't pony up when it comes time to make good on their promise.
Instead ... buy a good used tool. Chances are that it probably isn't going to break or wear out if it's already been in use for a number of years.
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