[GreyingJay]

Buy a name brand tool that you will be able to buy replacement batteries for in years to come, otherwise when the battery wears down and you can't buy replacements, the tool becomes garbage -- well, at least you could take apart the drill and play with the gearbox and motor!

So Ryobi, Dewalt, Makita, Milwaukee, Ridgid, etc. (Careful about Ridgid though - they do advertise lifetime warranties and all, but they also seem to discontinue old product lines and introduce new ones fairly frequently).

The nice thing about some product lines like Ryobi and DeWalt is the selection of tools you can use with the same batteries and chargers.