New to the Ryobi ONE+ range the Ryobi cordless drill/driver R18DD3-0 is a great budget tool. It uses the Ryobi ONE+ 18v battery range. Ryobi recommends using the 2.5Ah Lithium+ battery with this drill and claims it can drive up to 745 4x32mm screws with one charge.
It has a 13mm chuck, 2 gears and the really useful LED lights. It is most suited to drilling into wood or metal or for driving screws, without a hammer function it is less suited to drilling into masonry.